Mike Chestnut in TN does a fantastic job chroming. But for siderails, unless you want to break out the cloth and wipe the machine every time someone touches it, the stainless or powder-coat is the way to go.
You can buy brand new powder coated legs right from Pinballife for short change.
http://www.pinballlife.com/index.php?p=catalog&parent=7&pg=1
Terry stocks Red, Yellow, Orange and Black.