I've used the Makita 12 & 14.4, Dewalt 14.4 & 18V, Hitachi 12V, & Bosch 12V. I own the Bosch, mainly because I have alot of Bosch Drills, 18V tool kit, and they've always been reliable. I've had some bosch cordless drills that I used daily for over 7 years before I had to replace the batteries, & the only thing I replaced on one of the drills was the switch.
For cabinet & furniture building, I'd probalby choose the Bosch 9.6V impact, as the 12V has more torque than what I've experienced with the other 12V units. The hitachi 12V is also a nice lightweight unit. Anymore, it is probably just a personal preference of what you like to get a decent impact driver, as long as you stick with one of the more 'professional' grades offered.