Well personally I'd go for the albinos as out of the three, they're the ones I think are prettiest and most active (although bronze are as active as they're the same species - just different colour lol).
You could always go one further and see what other species interest you - and order some in? Sterbais are beautiful and hardy, and my metaes are very active (all be it at the back of the tank!).
Have a look on here - it's been my fave site for ages, great for a cory fix (and there's a few folks on here *ahem* CorysRusUK for instance if you're in the UK - who sell cories):
http/www.nettaigyo.com/corydoras/encyc/m-corydoras-e.html