if you like bikesdirect:

http://www.bikesdirect.com/products/...ane/turino.htm

$600
butted Al frame
disc brakes
rear rack braze-ons
easy to shoulder for carrying
up to 38mm tires for comfort

a rear rack is <$20 on amazon.com or rei outlet

spend another $100 at a local bike store to get it tuned and adjusted before you ride.

make sure you get something that fits you correctly. the largest size of this bike would probably fit you okay.