I am sure there are some better deals. but the one you picked is the one I'm using as we speak but mine a was refurb job from the same place paid 75 bucks. (they quit carrying it though). Works great. They also have a 400W refurb job. about the same price.
All a refurb is. is the ballast case with brand-new guts in it. Ballast, socket, and bulb brand new. just an old ballast case.
Shop around though. Online is where you'll find the best deal.