Mine is a Brother. Just what they had at Costco that day. Nothing fancy and I'm sure it has all kinds of plastic in it. However....I've made 6 kilts with it with no problems. Of course it won't handle tons of layers of denim, but then if I get to a part where my machine won't work well, like sewing through a waistband where the pleats are, I just hand stitch that part.
It's all good. I think it was about $100-$150.
Unless you're going commercial I just don't see the need for the big honking machines that can sew through tin cans.