I like vortex, but I'm not sure $200 is enough to get a decent scope from them. The Crossfire did quite poorly in a side by side comparison another CGNer did a few years back, and i don't like the big turrets on the Diamondback tactical for a hunting rifle.
Used Bushnell or Burris would get my vote in that price range. Personally I would up the budget a bit though, $300-400 gives you a lot more options and the nice thing about optics is they're not permanently tied to a given rifle so you can always switch things up down the road.