I picked up a 1/2 drive electric impact at one of the HF sales. I think I paid about $30 for it, and like Doc says, it is great for removal, but not so much for assembly.
I don't have air in the garage, so electric is the option that I currently have. I got the two year warranty with the unit, so if it goes squish replacement is a no brainer.
I picked up one of HFs angle grinder about a year ago for under $20, and it blew up while reshaping some metal I had laying around. I brought it in to them with the paperwork, and they handed me a new one. No questions asked. Kind of like how Craftsman is or used to be anyway.