GP2X is nothing like an Archos. It's an open source linux gaming device, it's pretty quick for what it is and has a massive range of emulators, anything from MAME to Atari 2600 is almost completely 100% perfect, even a few PSX games work at very playable speeds.
It plays Xvid movies extremely well due to built in hardware that allows full screen 700MB vids to play at full speed and even be played through a TV (and the emulators too)

The new F200 seems exactly the same as the older F100 except the touch screen and better D-Pad, No-one knows about other little improvements. Maybe not worth the upgrade if you already have a GP2X but I think it's gonna be the same price as the original so worth waiting if you're thinking of planning on getting a GP2X.