I like Milwuakee as they seem to be the toughest of the lot, and I tend to be hard on tools. I have an 18V Lok-Tor Hammer drill and have no complaints about it. I used it when remodeling a basement last year and it worked flawlessly, drilling and driving whatever I needed. I was able to get real good run time off of one battery too.
At the time I bought it I got a kit with an extra battery and a quick charger, and also a mail in offer for another battery. So I was able to get the drill, case, quick charger, and three batteries for something like $300. I like that the bateries are reversable, and that the same charger is used for all of the batteries so I wouldn't need to buy new chargers if I bought lower voltage tools.
At the time I bought it I got a kit with an extra battery and a quick charger, and also a mail in offer for another battery. So I was able to get the drill, case, quick charger, and three batteries for something like $300. I like that the bateries are reversable, and that the same charger is used for all of the batteries so I wouldn't need to buy new chargers if I bought lower voltage tools.