I agree with calla - you need to now about your machine before beginning the quilting 101 class. My personal preference would be the Babylock - but an even better deal is to purchase a refurbished or used machine from a dealer at least until you are sure you want to continue with sewing.
We are not trying to discourage you, just want to make sure you don't jump into too much too fast.
Another thought - maybe you could find a local guild and get with some of the members who could teach you about machines.