Why would you want to get a PSP anyway?
The DS is better and half the price. The only thing PSP has going for it is licensing deals with game developpers. If you buy a DS, good games will be made for the DS.
There's an MP3/movie player for the DS which only costs $25 and uses CompactFlash cards. Think about that for a minute... $175 vs $300 for two gaming systems which do more or less the same thing; which would you choose?