How long have you been researching a longarm? Do you have a list of must haves and can live without? Have you tried longarming at all? Some people have found standing at a machine, loading a quilt on the rack, etc are not for them.
Most people research, test drive, etc for a year or more. Before you consider any purchase, be it on line or with the support of a dealer you really should try going to a large show where there are several L/A vendors so you can at least try them out. There are so many considerations you may not even know what you like or dislike about the rack, the machine, ease of maintenance, after market support, etc.