10.5-1 is going to be more user friendly in terms of being more able to run pump gas. Any higher and you'll want to run something better than supreme from the corner station. I put a 10.25-1 Wiseco in my friends 88 warrior and he runs it on regular 87 octane without issue. What I mean is he hasnt't experianced detonation or preignition, but running supreme 91-93 octane, would be better. Thing is, you said, " get all this new for decent price", tells me you're budgeting. The JE is gunna be more expensive than the Wiseco. Especially the 85mm. 1st it's a bigger piston (bigger usually cost more), and 2nd it takes it's own gasket kit. You can save some money and go with the Wiseco and chose some thinner gaskets or have the head shaved .015" to raise the compression even more. With the head shaved that little bit you might get as much a 11-1 out of it. But that would require some number crunching that I just don't have the head for at the moment. You'll def hit the 10.5-1 mark. As for the Valves +1mm will get you more volume of air&fuel into the combustion chamber. Is it so much that it'll rip your arms out of their sockets? No. I really don't think it's worth it. Just having the valve seats opened up some will do the same thing. That's what my gncc&tt builder friend suggested to me when he did mine 2 weeks ago. I've been really impressed with the results. The purpose of the bigger valve is allow a bigger volume of air/fuel to enter the cylinder. But what you gain in volume you lose in velocity. Yes, porting is intended to increase volume, but if done right it'll maintain good velocity, maybe even gain some. That cam with GOOD p&p, pipe, piston, and increasing airflow into engine; I'd say you'd get a solid 10hp over stock. Do some carb mods or update to an Edelbrock and you'd get some more. Maybe as much as 13hp over stock. Another thought would be to install a hight perf cdi box. I can't run 1 on my 88 Warrior, so I can't say what the improvement is. I do have one on my 88 Honda 300 4x4 and it with the other mods I have on it blows the doors off the 2 stock 300's we have. Damn that was longer thant I thought.