Component cables will give every bit as good an image as HDMI and without all the DRM junk of HDMI.
I don't think it likely matters too much on the brand. I wouldn't go with the cheapest cables you can find, but there's usually very little difference between cables that may cost $20-30 and those that cost in excess of $100. Usually because the quality of the ports on the console or DVD player or whatever are not all that great, so the quality of the cable is largely irrelevant. I wouldn't spend more than $50 on a set of component cables myself, but if one set seems considerably cheaper than all the rest for no apparent reason, I would probably avoid it.
Also, assuming the 360 has the actual component jacks on the back, and doesn't use a standard proprietary port like the original Xbox -- I don't own a 360 -- then component cables are component cables, and you don't need to find some that claim to be compatible with the 360. Feel free to look over by the DVD players for cheaper cables that will work every bit as well. If the 360 has some standard port for video, forget all that.
I just bought a Samsung 50"DLP 1080p flaty w/ the video game mode if that makes a big difference and have an older model 360 w/o the HDMI hookup I was wondering what cable(s)and brand etc, would I use to get the best picture/ability out of my XBOX360 and or HDTV at the same time any advice would be helpfull?!?!?!?!?!?