Below is a list of tractors sorted by horsepower. Only the standard engine and top engine upgrade are shown. But when searching for a tractor in a certian HP range, you can see like vehicles.

Below is a chart of the tractors sorted by price.

Below is a chart with it sorted by cost per HP into the size of the tractor. I also left them in there own size bracket. since looking at a 600HP tractor next to a 100HP tractor would not provide allot of useful info.