Hawke MAP. Best crossbow scope for the money. Good optics for just $70, small in size, multiple aimpoints, built in range estimator, comes with free trajectory program. If you want one with a lighted reticule, their SR model does that but costs about 2x that.
I've used 5 different scopes/red dots so far, currently shooting with a MAP and 2 Excal LumiZones...MAP meets my needs best.