I have a Craftsman 1/2" drive which seems to work pretty well. BUT, keep in mind that Sears does NOT cover Craftsman torque wrenches under their "lifetime" hand tool warranty....Not sure why, but it's got a 1 year (IIRC) warranty. I've also got a couple of cheap-o 1/2" drive torque wrenches, 1 no longer works as a clicker torque wrench, so I use it as a breaker bar, the other works fine, and seems to be just as accurate as the craftsman. I would say if you only plan to use it occasionally, go for the cheap-o $20 wrench and spend the other $40-50 on something else.
The thing about torque wrenches seems to be calibration. I don't know of anyplace to get them calibrated that doesn't cost more than a new craftsman torque wrench!!
Bret.