Based on your post, the only parameter that impacts your Fico8 is your high utilization ratio. Your debt is not very high and if you can pay it almost off, you may boost your credit score to ~770+. Afterward, you may apply for a few decent cards with high SUB.
CSP earlier this year had a SUB of ~100k (AF waived) but I guess, it requires better credit score (check Chase prequal). Its SUB got reduced recently and you may consider other cards for the moment.
If you have upcoming travels, you may consider Amex Gold. It has AF~250$, while high SUB also (check Amex prequal).
Fico8: EX~EQ~TU~810 (12 month goal~840).
Welcome aboard, @Thediamond! You're in a great place for all things credit-related.
Something jumped off the page at me: your credit limits are very low, and your APRs are very high, considering how old some of your accounts are. With your current scores, I'm wondering why?! Have you requested credit limit increases and/or APR decreases with any of your accounts? If not, you might want to consider doing that with the banks that don't do a hard pull for CLI requests. In other words, you won't be hurting your scores by asking for CLIs, as long as the bank involved doesn't do a hard pull. If you need guidance on which banks do or don't, just ask! You could increase your overall credit limit--which would also decrease your overall utilization--without having to apply for any new cards this way.
This troubles me:
"I currently have about 4600 in my checking account and about 2200 in my savings. I can take about 2000 of that and payoff my old SPG or either my discover or capital one. Or I can continue to pay the minimum on time and save and then get rid of a card balance in one go."
In my opinion, making minimum payments should be reserved for when you have no other choice, such as job loss. Looking at your APRs, and thinking about only making minimum payments....ugh....my head hurts thinking about all the interest you'll accrue! 
This is my personal advice, my $0.02 worth, which you can take or leave: ALWAYS pay more than the minimum, unless you're literally unable to. Even if you're zeroing in on paying off one card, don't neglect the others by only making minimum payments. This is a good habit to get into. An even better one is to pay in full every month, but all in due time! 
@Thediamond what are your individual card utilizations? I'm in a similar situation that I started really getting aggressive about a few months ago. Some cards around %90 UTIL. I've been trying to formulate a plan that saves me interest and bumps my scores at the same time. Getting each account below %49 made a big difference in my scores but even then when I app'd few a few new cards I got a pretty low SL (assuming because of current balances, even with scores over 800)
@Thediamond wrote:@JFox418 - on my old SPG: about 95 %.
Discover: 55%, and about 40% on my venture one. Everything else is PIF'ed as of rn.
Can you make a payment on the SPG to get it down to %48? Then a payment on Discover to get it down to %48 as well? SPG is dinging you hard right now. I just picked up 28 points by getting two cards over %50 down to %48. The next tier is getting them down to around %28.
@Thediamond wrote:I could but I'd rather just PIF a card and not have to think about it.
Guess it all depends on what you want to do and when. I'd definitely worry most about that %95 card. That one is hurting you the most and would most likely keep you from being approved for anything. If that was PIF then your %55 card would be the worst one and like I said, over %50 dings you pretty bad.