personally, i think poker size ARE the best for a few reasons...
a; practicing with a larger deck help if you ever come across the situation where you use someone else deck... if they lend you a poker size-no probs, you've been practicing, if they lend you a bridge size, then all the better, i find things alot easier to hide!
b; IF you ever decide to purchase a gimmick deck most good gimmicks are available in Bike 808's, so seeing as you already have an 808, a 'deck swap' will be no problem for you.
at the moment, a really cant think of any more reasons...
but bear in mind 'a' if you practice with a bridge deck, and are then asked to do 'tricks' with a poker set, you'll struggle.... lol.