How To Capture in better quality Help??

[Force21]

Ok here is my situation:

I need a capture device to record video games and what not, but the problem is i have an HDTV and i am used to playing in HD Quality, i originally bought a DVD recorder to record but the video quality was horrible so i had to return it.

Is their anyway of converting basic video cables into HD quality?

I was told that an HD Tuner could do the trick, but i have no clue and dont wanna buy something if it wont work.

*Basically I think i need a capture card device were i can plug my Xbox 360 Component cables into the capture device and then the capture device will need to have component cables that i can then plug into my TV*

Also do they make HD capture devices?

Any help will be greatly appreciated.

Thank You

[Baldrick]

Please don't cross post. Once is enough.