Shop for a MP4 player

My friend wanted a portable video player, so we shopping around for a while. We found the following items that are worth taking notes:

- JNC M-636
Price: HK$980
Shop: Golden Shopping Center (A Grade something)
Review: [here]

- Speed MP4 player
HK$1280
- 3.5 inch screen, but seems slugglish video playback
Shop: Golden Shopping Center (A Grade something)

AMG Mp4 player
HK$680
- 2.5 inch screen
- No camera (camera version: HK$880)

IView mp4 player
HK$690

Finally I found a solution that is great for gamers: Nintendo DS or PSP. I put some dance practice video on Nintendo DS and while the result was not anything spectecular, at least I can use it to review some steps before dance practice.