I purchased my current machine from amazon as well, I’ve never had any problems with it or needed to repair it. Amazon doesn’t carry Husqvarna, Pfaff or bernina though, I would need to purchase those from a dealer. They do carry Juki and janome though but I’m not sure which models are the best.
I’m really looking for a machine that has adjustable pressure foot pressure, good feed dogs, a bigger harp space, needle threader, automatic needle cutter if I can get it and good lighting would be a plus so I didn’t have to use an additional light source all the time.