A decent wheelset will cost under $300. I just bought a set of Mavic Aksiums for $169. A set of Neuvation M-28's would do you well too. I've personally never been a fan of Bontrager wheel sets, which is what I assume is on the bike you are looking at buying.

The Fisher bikes look pretty nice. I got an up close look at one last year at a crit here in town. There were several guys sponsored by GF that had their bikes. All of them were aluminum and had DuraAce components and carbon wheels, so they may or may not be a reflection of the bike you are looking at. But from what I saw they appeared to be nice bikes. I talked to a friend who works at the local Trek/GF shop and he said he's thinking about one for his next road bike.

Just went and looked up the Arc Pro. That's the exact same frame the guys here were racing. For $850 I don't think you can go wrong.