Herb, if you are really thinking about spending $140 more for a kit that has been powder coating, buying a powder coating system might be a more affordable option...
I powder coated mine with a powder coating gun I got at a local auction (for about $10), a dollar or so worth of power from Harbor Freight, and a small toaster oven I picked up at Bed, Bath, and Beyond for about $30 (after using the wife's coupons). It was the first time I ever powder coated anything. It was much quicker and easier than painting. And the finish turned out nice and tough.
Harbor Freight has a Powder Coating gun on sale for just under $60. If you use one of their 25% coupons from their flyers, it brings the price down to around $45. So $45 for the gun, $30 for the oven and about $6 for a bottle of Harbor Freight powder coating powder. So for just over $80, you can by a powder coating system, that can powder coat anything you can fit in the toaster oven...