I lovemy brother pc420. I bought it on amazon and have been very pleased with it! It has a needle threader and thread cutter, start/stop button, knee lifter and every attachment I need for quilting except the 1/4" foot. I have attached binding and quilted 2 quilts on it so far with no problems. For under $500 you can have the machine, quilting feet and extension table.
I tried a janome dc2012 to start with but fou dthe stitch selection annoying and the delay in the foot pedal drove me nuts. I returned it to buy the brother and haven't regretted it.