[Black Dog]

I have Cox Digital Cable and want to upgrade to a better video card.
What kind of cards will capture in the best quality?
What formats do they capture in? (mpeg/avi/miniDV/etc.)
How do I find out what quality aud/video signal I'm getting from the digital cable box?

Any help would be appreciated

Operating System : Windows XP Professional (5.01.2600 Service Pack 2)
CPU : AMD Sempron 2000 MHz
Bus Speed : 166 MHz
Motherboard : AN7 (nVidia-nForce2)
BIOS : Phoenix 6.00 PG
Memory : 1024 MB (10ns)
Sound : NVIDIA(R) nForce(TM) Audio
Video : RADEON 9200 PRO SEC Family