panda's don't get very big and a 55 more than accomodate a herd of 15 - especially since cories aren't looking for separate hidey holes, they like one big cave to share.
Does that seem like too much of a bioload?
25 lemons 1 angel( i did decide to go with 1 instead of 2 or 3) and 15 corys?
might cut the corys down to 10 or something.
For filtration i have a magnum 350 and a biowheel 330, so 4 biowheels and the magnum is filled with bioballs. A lot of bio filtration, even so if that does seem like too much i would not want to overdo it.
Sterbai - If you got the money and want the best looking one imo
Panda - Want something better then broze/peppered, but not near the price range for sterbais.
Skunk - Ditto ^
Peppered - Cheap but cute, I had 20 of 1 inch peppered swimming around my 55 Gallon at one point. CUTE!
Bronze - Personally, I think they are "meh".
I actually bought pandas from my lfs because they were half the price of the other cories they offered...I think they were less than $4 each. They are pretty cute!