If you have enough slots for it, I'd recommend seperate TVTuner cards and the X1900XTX instead of the AIW.
ATI 550 Pro or NViDIA DualTV MCE (if you're going to use MCE) are both ISF certified and good quality, plus they have hardware mpeg2 encoding.
Vbox DTA 150 or DViCO Fusion HDTV cards for OTA HDTV (DVICO cards support unscrambled QAM too)
Also, keep your eyes out for any add-in cards that use the Sigma 8622L/8624L or the new 8634 chips if you want hardware decoding support for mpeg-4 AVC. Hopefully the Odyssey card will have encoding support too.