I just bought this bike: http://ibexbikes.com/Bikes/COR-CT-Details.html

I did lots of shopping around for a bike around $500 that would be light and somewhat comfortable. The specifications on this bike are a dream for its $370 pricetag. Only a couple of sizes available, though...

It's arriving tomorrow, so I can't say anything about it yet. But, I have read many excellent reviews of their bikes on the net, and their customer service was wonderful. I had lots of questions for them that got answered very promptly.