CMANavy was 6'4", 240lbs, and managed to make TE(2) armor work for him, so it really is all about fitting it.
I'm 6'0 - the only downside really is the shins. The differences between all makers for shins is miniscule in length and they'll all be too short. Phillip's solution is the best I've seen so far, but I'd really prefer one of those guys starts making longer shins, and perhaps even thighs. The rest of the armor (all makes) scales really well (I've owned FX, RT, and TE2 shins).
As Terrell says - all will work, some just take a little more work to "work" than others ;-)