Randy at the Meridian Sportsman's Warehouse is a really nice guy & used to have his own bow shop. He'd be a great source for sizing, brands, etc.
There's also a place in Boise near the corner of Roosevelt & Rose Hill called Bowhunter's retreat - a little shop, but they've been there a long time.
I shoot Martin bows (the brand) and have been very happy with them. Got the first one from Bowhunter's Retreat, and the second one from Randy.
Matthews bows are very good but a little spendy. PSEs are popular and good as well.
I haven't picked my bow up for a couple of years though... I think the last thing I shot with it was a carp.

Good luck, it's a fun sport.
Dan