First off welcome! To answer your questions we'd have to know a few things, mainly what is your budget, will you be doing any work yourself, how much streetability are you willing to give up in the search for speed, etc.
Edit- I would NOT choose gears until you know what kind of combo you will build. A high winding NA combo will be best suited with 4.10's or greater, a supercharged setup will not. IMO gears are one of the last things that should be chosen in a combo. The gear should be chosen to match the powerband and power output of the engine.