Hard to go wrong with a Cannondale for quality, I also like Scott bikes and they will usually give you a little more bang for your buck compared to the big names. Here are a few others that come to mind all of which are about equal. At the price point you're shopping there's nothing that stands out. Here are some others in your price range.

Specialized Bicycle Components
Raleigh Bicycles - Revenio 3
1.1 - Trek Bicycle
Z100 - Felt Bicycles