2015 YZ125 Big Bore Help

Here is my scenario. I've been looking online and talking to a few builders about big boring my 2015 YZ125 only to realize we live in a world with too many options! I'm looking for feedback from anyone who has done a big bore on this bike.

A little about myself: I'm a Pro MX rider in Canada and can qualify into the nationals fairly confidently (although i'd say i'm a decent B rider if were talking USA) and weight 170 pounds. Basically my weight is all i'm wanting the big bore for.

I've talked to Max Power RPM, Eric Gorr, Harris Performance, Pro Circuit, and few other local shops. I'm avoiding the athena 144 period. I also am only interested in the 134 or the 144 because of the piston availability.

So my question who has had luck with their builder and whats the preferred overbore size? I like the 144 dyno numbers but track performance means everything. Thanks for any help!