I use a Consew 226 with reverse. Excellent older rebuilt machine, the shop that rebuilt it for me swears by them, says they will last forever with the right maintenance and upkeep. I think it was around $1200 rebuilt (they go for $1700 or so new), including obviously the head, the motor, a brand new table, and I even got some needles and oil and stuff like that. Its been the only sewing machine in my shop for the last 4 years and i have never had a problem. Every month or so your stitch length will get knocked outta whack, or your tension gets bad, but those are easy unavoidable maintenance things that will arise with just about any sewing machine.
A few things to look for in a machine. It definitely needs compound walking feet. Definitely needs reverse. Make sure its "industrial." If i had to buy mine all over again, a few of my wants would be the bigger bobbin, and a long arm machine. Usually the standard machine has a 10" throat, while a long arm machine has a 30" throat. It would make a huge difference when sewing up a bench seat cover thats getting all bunched up in the throat of your machine....But long arm machines are expensive, check out the head only prices here
The good consew long arm heads are damn near $9000 new.