He has a PS3.
But it would be nice to get more people into our little circle.
However, I personally wouldn't buy an Xbox for Halo 3 online. It just isn't as good as Halo 2 online for so many reasons. But I know you've played it before but must like.
On the same hand, there is a nice community of Smashers on GT and we play like every night (ok at least me and Bluefire

) So personally.. I would say buy them both cheap if you can find it.
And if you get a 360, get the Orange Box.