Thanks for joining and let me see if I can help.
First off, the Treo 700wx features more memory than the Treo 700w and I'd advise you stick with the wx if you go that route. The Treo and the Q both run Windows, but different flavors. The Treo runs Windows Mobile PocketPC and features touch screen functionality. The Q runs Windows Mobile Smartphone (no touch screen). Both are technically WM5.
The Q is slim, very customizable and is a great phone. The Treo is a refined smartphone having gone through many years of improvements. It's also a bit more of a "handheld computer" than the Q. The Treo offers document editing "out of the box", but the Q now has document editing using the third party Docs To Go.
For more on the Motorola Q, check out
Everything Q.
Hope this helps. Welcome to ET!
-Chris