You can't go wrong with Cali Kings or Bulls, I have 2.2 Calis and a Snow bull male and they're fun and very hardy! (BTW Cali Kings get around the same size as Corns, they aren't on the bigger side). They both will burrow though given the opportunity, so keep that in mind that they both might not hang out in the open all the time.
And with bloods, I personally wouldn't put a blood into a 40gallon breeder tank: in my experience with my two (SSTP and a T+ albino) they do much better in tubs and most females will need an actual viv when adults: at least 4' with 6' for massive females.
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