Your score(s) are great, your INQs are great, you've got a year under your belt, you've already got a decent credit line with Discover, at this point, you can pretty much pick and choose two cards you really like and will most likely get approved.
You need to have at least 3 cards for maximum FICO scoring purposes so I suggest adding two more now and then in 6 months to a year, you can add more if you'd like.
It would be nice to know your income, but if it's at least $15-$20k your be alright for cards like the BCE or Everyday, Sallie Mae, QuickSilver, Freedom, etc.
If you would like a more in depth analysis on what cards we think would suit your needs, we need to know how much you spend on stuff per month. Are you a big gas spender, grocery spender, restaurant/fast food spender, etc?
@Anonymous wrote:There are multiple parts to my question, so any input to any part is greatly appreciated!
I'm 22, a student, got my first line of credit last May (Discover it. Just got a 2500 CLI!), and my score is ~740.
If I were 22 again, you know what I would do? I would go out and get 22 credit cards and kill my "AAoA" down to nothing and drop your score from 740 all the way down to 650.
Forget that your score is 740. 740 is for sissies, go for 850. In order to get to 800+, you can go at it slow and steady for the next 10 years or you can do it by breaking your score and rushing to 5 years.
In the world of lending, I have found:
1) Quantity > Quality
2) Quantity > AAoA
People always remember that you get bonus points for AAoA but always forget you also get points for Number of positive tradelines.
At 22 you have the rare chance to have some awesome credit that will serve you for a lifetime.
1) Before you apply for any "real" cards, go crazy on the SHOPPING CART TRICK. Pick up 20 of them from the biggest brands (Victorias, Overstock, Express, Serta, Eddie Bauer, Ann Taylor, Venus, Sportsman's Guide). Make sure you use the trick to save your Inquiries. Make absolutely sure the "trick" is working, don't come back crying about 20 new hard inquiries...they should all be soft inquiries.
2) Get some more "Lifetime Keepers". You have the Discover, add a few more big name banks that probably won't go out of Business: Get the cards but only use them like once a year to keep them alive. Do not forget to pay them off.
Get 2X AMEX (1x Charge Card and 1x revolver like BCE). Always apply for 2x AMEX at the same time as long as you can get the Annual Fee waived first year offers. Close the charge card before the next annual fee hits. The idea is to get 2 tradelines for 1 HP
Also consider getting a card like Sallie Mae, Chase Freedom, BofA BBR
3) Wrap things up with a CapOne Venture, CapOne Quicksilver, Walmart, Lowes, CareCredit,
You should end up with 20+ cards.
I am not saying you should use 20 cards, just get those tradelines onto your credit report and then forget about them.
Use only ONE card of the bunch and pay it responsibly...the other Prime cards, use once a year so they don't close the account. If the store cards/shopping trick cards close by themselves, so be it, they've done their job. Once on your report, you can expect those positive tradelines to add to your credit scores for approximately 12 years or more (depending on how quickly the store cards auto-close for non-usage). With those Shopping Cart trick cards, you basically get 12 years of positive credit without costing a Hard inquiry. .
After acquiring all those cards, forget about credit and concentrate on your schooling. Your credit will build itself in the background. Your credit will take a massive dump for the next year, but you are in school and shouldn't be using your credit anyways.
Down the line, you'll probably buy/lease a car (or two) giving you points for "Installment loans"
When you are 30 and decide to buy a house, your credit file will be thick and you'll be saying 'Damn, that CreditFlunky guy got me close to a 850 score"
With this plan, in 8 years you will have most of the FICO "bonus" points for :
1) Quantity
2) Quality
3) AAoA
4) Credit Mix
5) Mature accounts
The major bonus is you will never again have to worry about AAoA "hits" when adding new accounts. With so many accounts to start with, every time you add a new account, you will barely lose anything on AAoA because that's just how averages work.
Right now, you only have a 1 year AAoA...as soon as you add another 1 card, you drop to 6 months AAoA. What's 6 months worth to you? Do it my way and you will go to 0 months AAoA but in 1 year, nothing will ever be able to drop your AAoA again no matter how many cards you get.
You can Bite the bullet now and rush to an 850 score or you can do it slowly like a timid mouse and later cry about "Oh I don't want to add another account because it will drop my AAoA in half because I only have 1 credit card". 
@inthewoods wrote:
1) Yes.
2) Yes, in the long run it improves it. Age of credit is an important part of credit scoring.
3) Yes, it’s a good card. For scoring purposes, the brand of the card doesn’t matter (only credit line, etc) but some people believe that manual underwriters will prefer prime lenders such as American Express. Amex is a good choice if your credit score can support it, and it sounds like you have a good shot.
4) No, I wouldn’t worry about that, unless they are very recent. Is that 3 inqs across all agencies, 3 for each, or 3 for a single one and nothing with the others?
5) As long as it has been 6 months you should be fine, especially since your credit has improved a lot since.
Each report shows three. Thanks the the response! I think I'm going to go for it.. Reviews seem to show that people like Amex Blue, and the $100 intro rewards is appealing (plus te card looks cool
)