Do yourself a favor, and instead of thinking about what brand you want, get yourself to a PGA pro who can FIT you... that driver will be useless to you if it's not right for you, and you have no idea how many variables go into fitting a club to a player... PGA professionals have been trained in club design, and club fitting...
These days, top of the line drivers are several hundred dollars each... you don't want to piss away that much money...
But as for brands, if I was in the market for a new driver, I'd have to look at the Taylor Made r7 CGB Max... it comes with 3 different shafts that are apparently easily swapped out, and 9 different weights for modifying the driver for the day's conditions, or your swing problems that day... TGW.com has a great deal on them right now, their suggested retail is $1000.00, they're selling them for $400.00... it comes in 3 different lofts-- 8.5 degrees, 9.5 degrees and 10.5 degrees (that's part of where getting fitted by a PGA pro comes in)...