I have x1 200GB Seagate, my 37GB Raptor, and a Maxtor 80Gb (Always broken, so it doesnt count) And I like to have all my music lossless, which I got off a friend, I also like Family Guy, so theres a bunch of that on there too, and I havent ever filled up my drive. I also keep all my games as disc images, and under that budget 250GB is prefectly adequate, if there is a problem, just delete something! its not exactly a hardship!
Very respectable builds there will last for a while with that budget, hope he doesnt want an LCD!