the psp is expensive because its basically a portable ps2. it can do more than the ds can. the ds is a portable n64. to each his own. the psp will appeal to those who like the psx and ps2's while the ds folks'll go for the ds cuz of their experiences with the n64. only problem is the ps2 is way better than the n64 in every way so you get your money's worth. the ds is inexpensive since its a portable n64 and so on.