Replying to Concept Length

I am picking up a 03' Concept and trying to figure out what sixe I should be on.

5'7', 175lb, very stong legs, I do the whole mountain, but love to do tricks.

I am debating between the 165 (which I feel will be too short) and the 178 (which might be too long) ???

Thanks

Late
fakie
Bones Will Heal,
Chicks Dig Scars,
Pain is Temporary,
But Glory Is Forever!