I'm using regular 16 gauge copper wire from Best Buy. $20 for 100 feet. Maybe I've got a tin ear, but it sounds great with my 1050. My cable runs aren't that long, though; my three fronts are only about 6' each.

I'll probably upgrade it to 14 or 12 gauge when I get a 770. At the time, though my 1050 was sitting in my living room and the thickest stuff I could find was the 16 gauge, and I didn't want to go store-hopping before I'd even powered up the 1050.