As per our discussion in the training section, I think I'm spending this money on membership at a fight gym.
The problem here is that I prefer the DS as a system (better controls, cheaper), and I don't care about the PSP's extra features. Who wants an MP3 player that big?!? But I prefer the PSP's list of titles and its graphics, so I feel caught between the two. Yeah -- better to spend the money on fight training.