Im using the Hauppauge WinTV-HVR-2250. It has worked great for me.
Case: ANTEC 1200
CPU: AMD Phenom II X4 955 Black Edition @3.9
CPU Cooler: XIGMATEK Dark Knight
Mobo: GIGABYTE GA-MA790FXT-UD5P
Video Card: EVGA GTX 275 Superclocked 1792MB
Power Supply: CORSAIR CMPSU-850TX 850W
Hard Drive: 2x500GB MAXTOR DIAMONDMAX+ 2x750 WD+ 1TB WD External
Ram: OCZ Gold AMD Edition (2 x 2GB) DDR3 1600
Sound: SOUND BLASTER X-FI/Logitech Z-2300
Monitor: 22 Inch Acer Ferrari F-22
Tv Tuner: WinTV-HVR 2250