I am looking to purchase a new sewing machine and need some input. I have been sewing for 15 years and I am using a very old Singer, at least 35 years old. I will mainly use it for making clothes and quilts, and for heming jeans and misc. items. I have looked at several units and see some things I would like to have. Automatic treader, one-touch button hole, zipper attatchment, thread cutter, retractable feet, ect. I was told that a Brother is a very good unit and also the Viking. I want something that will also sew heavy decorator fabric as well as jean material. I have also heard that I want to make sure it has metal gears, not plastic ones. I am looking to purchase something that will last me 30+ years and would like to keep it around or under $500. Any advice would be helpfull.