I second Ironnads. I just picked up an 8GB Voyager and love it. It is rugged, and if you by chance do lose the cap Corsair will send you out a new one free of charge. Plus its very fast, fits your price range, and is half the price of the GT model.
Also, heres a helpful article:www.consumersearch.com/www/computers/usb-flash-drives/review.html. It also recommends the Voyager but at the bottom it lists a bunch of reference sites. The article itself also compares a few of the top models. Good luck.