You could go check out the store at xtreme tactics in winnipeg. There are quite a few different models on display for sale (mostly AR's) and in the employee's private collections (the owners in particular) that they would likely be more than happy to let you handle if you ask, and get a feel for what suits your situation. Also i would go plastic to save weight.
Travis R. (aka Trapper)
Canadian Airsoft Marines. Field owner