Here are some more options:

Schwinn Voyageur 21. Has everything but lights.
http://www.performancebike.com/bikes...12_-1___400307


Schwinn Voyageur 7. Simpler version of the above, with only one front sprocket. (so 7 speeds, instead of 21, no big loss in a bike of this type) Youd' have to spend some of the savings to put the rack and fenders on it:
http://www.performancebike.com/bikes...87_-1___400307


This one's pretty appealing to me, since it has the internal geared 3-speed hub and a belt drive. (no grease on the pants, ever!) Also comes with fenders, a rack, and panniers included for $275. Looks like it's marked way down because it's new-old stock:
http://www.performancebike.com/bikes...08_-1___400307


I see they have $50 off this weekend, for purchases of over $250. That last bike qualifies, so you could get it for $225.

The Torker T300 looks good too. Includes the fenders and a nice 3-speed internal hub for $440.
http://www.torkerusa.com/bikes/commute/2012-t300


Unless everyone says the GT is a piece of crap, I'd probably go with that one, followed by the Schwinn Voyageur 7 or Torker T300.