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Yes, you can get a hardware / software bundle with the card which will come with the particular tuner you've chosen. Currently, we provide Hauppauge tuners with our software -- they generally seem to function the most reliably and we've been working with them long enough to assure most of the kinks have been worked out.
You do not have to use a card that is bundles with SnapStream -- the general notion is that cards with WMV drivers sets will function with SnapStream. So other Tuner / Capture cards or devices will work as well, (ex radeon theater cards, nvidia personal cinema...)....
Currently, only analog tuning and capture is supported (or input via Svideo, composite or coax from an external receiver) -- if you get a higher end digital card, you may and probably will not be able to get it working with snapstream, and some of these cards have not been tested.
In any case, you can also use an external receiver -- tuning is done with an device known as the IRBlaster which essentially emulates your remote control -- or there is another option that uses a serial tuning method for select receiver types-- refer to the support pages for more info. All of these items can be obtained through the snapstream online store.
You can run both of your recievers to your snapstream box at the same time (either via a manual switchbox or through seperate inputs) -- however, tuning and swapping between channel sets might be a problem, to my knowledge, the IR Blaster can only be setup to work with one device through snapstream.