Quilter's Review has reviews of many of the quilting machines. Here's the list:
http://www.quiltersreview.com/welcome.asp They also have a forum where machines (and other products) are reviewed and discussed
http://www.quiltersreview.com/forum/...sp?FORUM_ID=22.
You can also compare sewing machines (or most anything else) at websites such as consumersearch.com, bizrate.com, epinions.com, and nextag.com.
Happy hunting!