For flourishing, I love Wynns. (The Violet ones fan really well, and after a little use so do the red ones)
For card magic, I ONLY use Bicycle (poker 808, the standard ones). They're cards that the people I perform to can easily relate to and recognize. I usually use red, it provides for more contrast than blue usually does - making it easier to see.
Although I rarely actually perform with them, due to the fact I like them so much.
Since I mostly do signature effect (anniversary waltz, ACR, etc...) I just go for reg. bikes.