1 - Does such an "All-in-one" system exist?
No. Any DVB FTA receiver is able to receive DVB FTA and DishNetwork/BellVu. Unfortunately, most of DN/BV channes are encrypted. The audio channels are FTA
2 - Can it be done with one rotatable small dish (how small?) or will it require two dishes? (Two dishes - or a big dish - might be a problem in some of the apartments I want to move to)
YOu can get a H-H mount to move the dish. I recommend you start with a 90cm if possible. If not, 76cm is OK but you might face the "rain-fade" problem when it rains hard. If you only insterested in T5 and DishNetwork, you can set up a fixed dish for T5 (76cm will be OK since T5 is a strong bird), a 18" dish for DishNet. Then use a
Diseqc switch to switch between these 2 dishes.
3- Can anyone recommend dealers/installers in the San Jose, CA, area?
I don't know if there are any dealers/installers in Bay Area. But I am confident to say that you can install the dish by yourself. Lot of great folks here are expert. Plus,
Sadoun has a very nice instruction of how to set up fixed dish as well as motorized one. I recommend you place your order here. Jamal Sadoun is a very nice person, he treats his customers professionally.
Michael