Most bankcards from essentially every lender (with some credit unions capping lower off the top of my head) can be $30,000 or more, often much more, depending on your profile, income, and assets; the "best" really just depends on what you want out of a card.
If you're not spending more than about $740 a month across all of your cards, is there any reason for higher limits?
[Mod cut: Quoted post has been removed for violation of the myFICO Terms of Service.]
I've never had nor do I have access to a high income or monster limits, so members that do can answer more particularly, but I don't think many people of whatever profile divide their monthly spend evenly by their number of cards and then charge that to each card every month. Rather, for the members you see here with a large number of cards with high limits, I expect some of the following to have been part of their history in getting them:
1) Long-term high income, such that the spend they put on the cards they do use substantially in a particular month can come to a reasonable portion of the limit.
2) High spend (at least relative to me), possibly supplemented by business or reimbursed work charges.
3) Card rotation, both long-term and short-term. Short-term, a card may be in the sock drawer or see minimal use for a few months and then be switched out into active rotation so that, ultimately, most cards see reasonable activity. Long-term, they may have accumulated multiple high limit cards over time just through the normal consumer credit card cycle. It often happens that a consumer is attracted to a card's rewards structure, uses it substantially for a period during which they are approved for CLIs, and then lets it fall out of rotation when spend patterns change or a newer card offers more attractive rewards. If you're doing this with a high income and strong profile, you can end up with multiple high-limit sd'd cards, in addition to your current active lineup.
4) Long credit history. Kind of touched on this above, but I expect a lot of the MyFICO high achievers have maybe a couple of decades or more of reported credit history. In addition to building up high limit cards over time, this combined with high income and a generally strong profile supports higher starting limits.
5) Limit reallocation and card combination. With the issuers that allow this, disuse of cards from the same issuer over time can lead to the credit that issuer has extended becoming concentrated on a single card if the cardholder is one who opts to reallocate and close. I think also for some issuers, like Chase and Discover, this can be the most direct way to build up a large limit with HPs.
Ofc this is all just supposition on my part. Those here who have actually done it are the ones who can really tell you how it's done. 
