RE: Brillelli Boyz
For the MINIMAL weight difference (particularly with new mufflers Scott is working on) the 46 would be my choice, hands down. I would get the Synchro version, just to smooth up the low end, but probably not really necessary. That CG Yak was plenty beefy to hold up.
Probably with your altitude, the 46 would give you just the right amount of extra power to make it a LOT of fun.
If I were doing another, I'd hang the 46 on there, no doubt.