32GB - he will have about 12-15 gigs left over after a fresh W7 installl (W7 takes about 15 gb - 20GB). Depending on installation.
It would make a very nice boot device.
I can't for sure say how the Onyx series is as I have a vertex 2 120GB and it's been good to me.
But yeah - thats a nice present. At 60 bucks what could go wrong? At the worst he would have to RMA it - and at the best - well he will save a boat load of time when restarting/starting up programs.
I would say go for it