Just an idea but you could look by product like Sony, JVC, etc and then find what the best one that fits your needs and interests. Personally I would stay away from Comcast, but thats just me, I dont like there equipment at all and you have to use it.

If you go by product then automatically the HD SAT receiver carrier works with a paticular DirectTV or DishNETWORKS.

CNET & ZDNET are good for product reviews and whats out there.

Hope that helps!