If you can wait for a quilt show, it will be full of machine vendors just dying to get you to try out their machines. It's a good place to test drive a lot of machines and see what you like and don't like.
You can piece quilts on any machine. For quilting, you need something strong enough to sew through all layers. My personal suggestion is a vintage metal machine with a "potted" (internal) motor. They are gear driven rather than belt driven, which makes for a stronger sewing machine. They are also in plentiful supply, and for not much money.