Since you will likely be doing some quick movements side to side like a cutting horse, I would at least invest in some splint boots. That will help prevent fractures to the splint bone (not really serious but ugly when they heal). IMHO, when it comes to boots for something that could be considered stressful on a horse's legs, overkill on protection isn't always a bad thing. I would go ahead and get a pair of SMB's for the front and back and a pair of bell boots for the front. That wouldn't be too much and that added protection may also prevent a bowed tendon or pulled shoe from overreaching during an extended lope or a run.