bore out to a CR133 or 144?

I plan on getting my bike (99 CR125) to either a 133 or 144. Which would be more practical? And where can I find pistons on the internet for a CR144cc? I NEED more power from the upper rpm's, I was looking at the DEP pipes and I've heard nothing but excellence from there pipes, but,,,,,since my bike is going to be bored out, Eric reccomends having Fatty Pipes on the bike, so im stuck on which pipe to buy. My RAD valve just plain out sucks, wanna get the V-Force Delta 2. I mainly ride WFO in huge pits that consist of lots of straights and jumps. what porting should i get along with the big-bore? Thanks!