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brake horsepower-power measured at the engine output shaft( there are various nuances for brakehorspower regarding whether or not the accesories are being driven but we don't need to get into that here.) PTO horsepower - measured at the PTO shaft= brake horspower x (1- eta mechanical) where, eta mechanical is the mechanical efficiency of the gear train and driveline between the engine output shaft and the PTO output shaft. Drawbar horsepower is the power supplied to the rear wheels and is a function of weight and ballast, tire pressure, soil conditions, weight distribution, rpm, etc, etc and is an indicator of the number plow bottoms a tractor can pull. The best reference horsepower, in my opinion, is PTO horsepower. Brake horsepower is an interesting number from the engine output standpoint and if a subcontractor supplies and engine for a vehicle, it's important to the vehicle designer. But when you're looking at comparing existing tractors, the PTO horsepower is the best reference(in my opinion). Drawbar horsepower is usefull but may not reflect the conditions that you are operating in, and if you have autility tractor and don't do much plowing, it's not very useful.
With regard to your implements, if thy are Cat 1, then get a tractor with a Cat 1 hitch.
Hope this helps you.
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