I learned the hard way that the simple mechanic machines are the best for me. I can live and quilt without the extra features. The simple ones seem to be the most reliable since there are fewer things to go belly up. And, they are easier to find repair guys for them. Actually, I bought a Singer Heavy Duty one at Walmart a few years ago for $99 and it does everything I need. And, I quilt lots and lots of children and baby quilts!! So far, never had a problem with it.
If it does break down, I think I'll not take it to be repaired... It would be cheaper to get a new one!