Honestly
PSP...you want to watch movies on the go and play some decent exlusive games. If you are lucky you have a unit capable of homebrew and that turns this machine into a must have for most retro gamers...
DS...great first party games and free online service for some makes it a good overall choice. And the touch screen while a complete gimic in some games, and not used at all in others is very useful in games like castlevania and the upcoming worms, it just adds more screen space if nothing else, and the DS's clamshell design is always a plus. The homebrew/emulation scene for DS in my opinion is weak...
GP2X...movies, homebrew, emulators, an amazing scene, up to 2Gb of space on one SD card is the firmware limit, but with more updates coming quite frequently, there is no doubt that 4Gb will be supported in the future. The GP2X is just limitless...albiet there were some hardware issues to start out with, and the joystick isn't the best (granted niether is the PSP's but at least it has a d-pad) I think for any coder/linux/portable entertainment junkie, at $189.99 the GP2X is a MUST BUY. Do not buy this if you think you will get all the info you need fed to you...because you need some sort of knowhow about how things work and you'll have to do digging of your own on sites and forums to answer some questions...
Personally i own a GP2X, and a DS...and those together suit my needs quite well...if you don't have a console though, and you're not good at tinkering with things without braking them...get a homebrew capable PSP and a DS...
If the GP2X gets some decent commercial games (maybe not mainstream) I think it will be the ideal choice for all you portable entertainment needs with no restrictions on running whatever you want...
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