you should give S&K a try. i think that they have the best bang for the buck. i have a mix of alot of different tools in my box. i have everything from mac to S&K to craftsman to sunex. generally you want to stay away from the really cheap tools when you are buying impact tools and sockets(ever see a cheep impact socket explode. not fun), torque wreches and stuff like that.
http://www.thetoolwarehouse.net/
http://www.eppys.com/