The newer TV Wonder series cards, the 550 and 650, have been shown by Anandtech namely and others to have excellent video quality with all their fancy filters and such. I use a 550 with Windows Media Center, the quality is superb and a huge step up from the prior TV Wonder and TV Wonder Pro cards I have owned. The card also has performed absolutely flawlessly in terms of stability in Windows Media Center with the system up for over thrity days with constant daily use and hasn't crashed yet.
If you are planning to use Windows Media Center then I would definately go with the 650. If you are planning to use other software then it is more debatable as the Catalyst Medies Center software which is included with the 550/650 cards, which I tried leaves a little be to be desired. As far as the Hauppage options, I am not real familiar with what they offer.