I have the Brother PC420PRW- bought one at Amazon for just under $400 8 years ago. When it bit the dust last year after many hours of sewing each week and often using upholstery fabric and threads, etc. I bought another one. The second one came from Home Depot last Oct. when they were having a sale on them. It was $320 + $15 or $16 for shipping. Home Depot and Amazon have very good return policies, but I would still take it out of the box and make sure everything works on it as soon as you get it just to make sure.
Lots of folks also like the Eversewn machines which I think can also be found on Amazon.
Rob