I found a lately released SD card of the similar function as Nintendo SD card but the price is lower, it is Media gamer, you can go to their website to have a look, it will help you save money, the URL is http://www.mediagamer2.com/en/
I don't know GP2X, but I think the touch screen of the DS perfectly fits to point'n'click gaming. The stylus comes the closest to PC comfort. The cross is way too slow on other systems...
The only drawback I see is that some games don't work.