IMHO, post up on Slowtwitch.com

Some responses will be similar as in BF, but that forum is better equipped in terms of it being a triathlon forum. Not only that, fitters, vendors, and coaches routinely post advice.

Some of their first comments may be similar though, like obtaining a triathlon bike fit before looking at specific bikes. Different bikes can accommodate different fit coordinates sometimes to an extent it eliminates choices.

That's an expensive enough set of bikes (P3X or the Tririg that was proposed) that I would get a fit done before buying the bike.

It's just enough money you're spending I would steer you over there even though be have tri bike folks here, and a subforum for it here.

Good luck.