I'm getting good, quiet service from my USB external Seagate 1 TB drive. It was a breeze to setup - attach the power and USB cables and you're done! During operation it runs stone cold quiet, I rarely hear it and it's only 2 feet away from my left ear.
I believe they are selling for right around $100 and the 1.5 TB model is going for about $150. Check NewEgg.com, TigerDirect.com, or MicroCenter.com
I recommend you stay FAR away from Buy.com, they ripped me off for a $100 rebate and then basically told me to go pound sand...
-RW-