The helix from tapwave (palm) is going to be great as well possibly even better then the psp and it's up for release this christmas.
pros: ATI 3d chipset + 8 mb video memory, 200 mhz motorola arm9 cpu, a rumble feature, an analog controler, 430x320 resolution, blue tooth and much more stuff ... and here's a screenshot of what the games should look like.
cons: it's a pda so it's expensive (300 dollars) and the design will probably be horrible as well