Intended ranges? Location of hunting?
For me, considering the locale here, I'd go with a 20" heavy contour; short (really short on the Encore frame) enough for treestands and stalking around, but heavy enough and with enough velocity for long-range when asked of it.
Of course, if you're gonna be doing some long-range stuff, a 24" or 26" might be more applicable.
IMHO, with that round, anywhere between 20" and 26" works just fine and would get dictated more by use and terrain than by ballistics.