Not that bad of deal considering the cassette and tires. I'd check to see how much wear is on the rim though. If hardly any, then the price is decent, but if the wear is noticeable I'd talk him down to $220-240, if a lot of wear, I'd pass and if you don't like the tires and don't need it. I'd talk him down to $200.

Personally, I'd rather get buy a brand new Mavic Askium Race wheel which can be had for around $200.