I have a Dishnetwork box as well. So i'm hoping i can use that!!
That will NOT work. eyeTV Hybrid is a tuner. It will tune radio waves coming in. Dish Network box is already a tuner. Getting an eyeTV Hybrid has no use. eyeTV Hybrid is only for a coax cable going to an over-the-air antenna to receive broadcast television.
If you have dish network, just get their DVR. If you live in a bigger city that has OTA HD stations (I live in Kansas City and get 8 HD stations OTA), all you need is an internal or external antenna to connect to the eyeTV hybrid.
Here is my summary.
For HD and digital content,
Encrypted cable - get a cable box from your cable company or use Tivo Series 3 with cable card, or a now-discontinued Sony DHG-HDD DVR with cable card. You can also use the soon to be released Vista based DVRs.
non-encrypted cable - eyeTV 500 (discontinued). It has a QAM tuner.
OTA HD - eyeTV hybrid or eyeTV 500.
Dish network, DirecTV - use your content provider cable box.