G6 Lite, M3 Lite - both work well.
1. No
2. Yes
3. Yes
4. Good, AFAIK. The navigation in the GBA menu is not fun, from what I've heard.
5. Cuz DealExtreme is a cheap site.
Take it from me, get an M3 Lite. Never had a problem with it and you can have more than 512mb of memory.