Crazy Neo,
Having had a quick look around the site you've suggested, they all look like AMV/MTV type players to me, and not particularly well priced either. I cannot recognize any as Rockchips. The closest to a Rockchip is this fake Meizu:
http://www.radiopopular.pt/catalogo/...p?idprod=12128
...but even then, the spec says it is a MTV format player (although specs on sites like this are often wrong - they just copy and paste!).
Moding Rockchips is dangerous. They hardly ever come with Firmware so if you screw up, you almost certainly won't be able to find a compatible one to bring your player back to life, unless you are lucky / have a Teclast player etc!