Regarding your subj header, thank you for pioneering honest financial disclosure among FTers. If we were all so forthcoming about how much we have!

But seriously: IMHO, you are dealing with a nontrivial chunk of cash, and should be more concerned with returns on that cash than with miles.

If you want to be earn decent risk-free returns and earn miles, buy $30k of us savings bonds with a mileage-earning credit card. Note that savings bonds outperform CD's and money market accounts.

If you want to be very liquid, put some time into seeking out the best money market rates -- IMHO, returns on mileage-earning money market accounts are abysmal.

In general, following general sound principles of money management will pay off much more than any miles you may earn on one banking offer or another.