josh - ultimately, it's yer bow and yer call. if you have a true 29" draw, a 70" length will be noticeably smoother when pulling string. my 68" big 5 with caramelized boo and string follow is a tad under 55@29 and pulls ok, but i shudda got it at 70". hmmm, i hear the classifieds calling ....
personally, i prefer all boo for the limbs and i'm liking the caramelized flavor even better.
i just ordered a tembo blank, 70", 47@ 29 (knowing full well the bow will finish well over 50#), tillered to 30", caramelized boo limbs, slight string follow, clear glass, plain reinforced ends, cocobolo riser. will install a connexion hinge.
the fun never ends, as it should be