If you want to really do it up nice, and your planning on recording stuff as you match it, get hauppage's they have hardware mpeg2 encoders which wont tax your CPU. ATIs rely on software encoding and are asking for trouble.
Thanks for the advice, I was going to get ATI cards but may now consider Hauppage. Which cards have two tuners? So you can do PIP then? Any of these have splitscreen PIP instead of one small box within a larger one?