I agree with Buckeye Rose. I would check out some of the long arm quilters on this board. The 120" may be an issue for some. Even though many frames are 10 feet, you can't put a 10 foot quilt on it. you loose several inches on the ends. You can have a whole lotta quilts done for $15K. That said, I purchased a used Tin Lizzie and am having lots of fun. You do need to test drive as many brands as you can.
There are many posts on this topic, if you do a search you will get lots more info. here's a recent one:
http://www.quiltingboard.com/t-137755-1.htm#3703692