Let's start with, what is your "budget"? That is going to be the most helpful piece of advice for us to give you options.. then what kind of riding do you do? Get us those answers and we can go for there.. and also a total list of what you have now will help as you may be able to improve from what you have. Cause if you have a true trinity stage whatever, usually the cyls have been over ported. And with that said your cyl you have will not work with a 4mm crank.. jmo