[TerrysSPF]

As people have already mentioned, for the money Roush asks for one of his engines I'd shop around before making a purchase. I've heard good things about Brent and I know people with Craft engines who are very happy. They also stand behind their product, which is huge when you're talking about engines that put out this much power and can develop issues.
Good luck with your SPF. I'm just getting back into it myself after selling my SPF a few years ago and now I have the bug again. Been checking out engines / builders and pretty sure I'll be going with KC if I end up buying a roller.