I dont know anything about the cheaper machines. I bought one at Joanns for 1100 that has a 10 inch throat, stay stitch, needle down and many other features.
I bought it there because it is so accessable, and the sales girls are always around for info.
The only problem Ive had with it is the 1/4 inch foot dosnt cover the feed dogs so it was jurking to the right. When I asked they told me to get an edging foot and adjust the needle for 1/4 in, that solved the problem.
I know they sale cheaper machines and even carry other brands. I really like that it is so handy to ask questions and get parts.