What's a good capture card?

i need to know the best capture card for xbox 360 that is an affordable amount of money. my operating system is windows 7 home premium 64-bit/ Toshiba, Satellite L505D with a AMD turion II dual core mobile m500 processor. i don't want to spend an ungodly amount of money because i am only 16. what i need is a capture card that can capture real time (xbox live) in HD. The games i need it to capture efficiently are Halo Reach, Halo 3, Mortal Kombat, Modern Warfare 2, modern warfare 3, black ops, and others like that. so i would like some help. i had a dvc 180 but i did not work whatsoever with my computer. so please help me out. Thank you.