I would definite recommend UPS for computer. Its all depends on how long do you need to battery to last and what kind of computer is plug into the unit. If you don't need a long battery running time, pretty much any UPS will do the job. Check out Staples
If I understand correctly, GV can only receive calls and forward the calls to your number right? You can't call out using it, and you still need a cell phone or landline phone to make calls.
Already there is a car like that. It was in a Taiwanese auto show. For only 100k NTD or 3200 usd, they can add the hydraulic lift and the gaming system to your car. The modded car in the show has video projection on the windshield and hydraulic lift for gaming feedback.
Here is the video...