My personal preference is the Innova by ABM International. It is a family owned and run business that has been making industrial quilting machines for 70+ years and make a wonderful longarm for home quilters, whether for business or just yourself and they have a real, live person 24/7/365 to call if you ever have a problem or question. You should check out Renae Haddadin's article on shopping for a longarm:
http://www.quiltsonthecorner.com/inc/sdetail/1349
You have to "buy" the article for $00.00 and then you can access it. It is worth it's weight in gold (or stash). She knows the questions to ask, ones I didn't know to ask before I bought my Innova (still would have bought the Innova!), but it would have made the process so much easier for me.