I own a Nolting 24" PRO on a 12ft table. I only quilt for myself. BUT I suggest you join these 2 popular longarm forums and ask those questions.
http://mqresource.com/forum/ all makes of machines
http://forum.apqs.com/ mostly apqs machines but others join too
Most of those on these 2 forums are in business and have been for sometime. You will need to 'join' in order to view/post.
There are many of forums for long/short arm machines on Yahoo also, here's 2.
http://groups.yahoo.com/group/Nolting_longarm_quilters/
http://groups.yahoo.com/group/MQSG/
Good Luck