For a tuner, I would highly recommend that you get a dual tuner rather than a hybrid like the one you linked. The difference is that a dual tuner can pull two broadcasts at the same time (record one show while watching another for example). A hybrid tuner can only switch between ATSC and NTSC broadcasts, but cannot record or display two broadcasts at the same time.
Here are some dual tuner PCIe cards:Hauppauge HVR-2250AverMedia A188 Duet
I personally have the A188. There are some of these cards that have a problem with disappearing. I had that issue and had to RMA for a replacement (around Nov. '09). The new card is GREAT. Just thought I would warn you because I'm not sure if the stock of defective cards has been depleted yet. I hear good things about the HVR-2250, but it is more expensive than the A188.
Here's a good resource to do some reading:http://www.hdtvtunerinfo.com/