At bitcoin spot price?
I'm no expert, but I'd be careful on this one. Mate, if you need Bitcoins, just go to MTGOX or BITFLOOR. Both sites are very trusted.
If he's using PP, which he is, he can just say you never sent him the BTC and PP will side with him. I know because of an experience that made me decide not to use PP anymore; lost over $150 to a scammer. RuneScape gold >_<.