Thanks for the replies.
For the PSP, will you be getting games via UMD or mainly through digital downloads off PSN? If the former, PSP-3000. If the latter, PSPGo or spring for a Vita.
For the DS, will you be playing any GBA games or only DS games? If the former, go with a DS Lite. If the latter, try for a 3DS since you'll be able to play games both old and new.
Is the PSN more for those that have a PS3? The reason I ask is that I don't have a PS3. It if it is, then I will go with UMD. As far as the DS goes, I would like to get a XL but they are a little pricey, and yes I would like to play GBA games on the DS.