UPS for my network

OK guys, I am not electrical engineer, so I need some help here.
This is my issue:
I am planning to purchase a UPS to cover my small network. It consists of:
- iMac 24" (Lion) with two external hard disks, both powered from the USB ports.
- Mac Mini Server (previous year, Lion) with two external disks powered by small brick converters.
What I would like from the UPS, is to provide enough time for the iMac and the Mac Mini to shut down gracefully when the power fails. Ideally, the UPS should send a signal to the two machines instructing them to shut down (I think this is possible with the Apple computers, not sure, hence the question). I would also like the UPS to be capable of powering itself up, and hence power up the computers, after a power failure. Finally, of course, I would like the UPS to provide protection to the computers, in case of over- or under-voltage conditions.
My main questions are:
- How many VA should the UPS be, to cover these two computers and perhaps a couple of Linksys routers? I know there is a formula that allows you to calculate that, so if you can give it to me, I would appreciate it.
- What brands would you suggest? I know that you US residents have access to much more brands than we have here, but give me your thoughts and I'll see what I can find locally. APC does exist here, I think this is a brand you have in US too.
- Wbat else should I know before I buy the UPS? Anything that can help me make the right decision would be appreciated.
Many thanks for your attention.

I just thought of something. Is it possible for one UPS to notify more than one computers that the power is down, so that the computers can switch themselves off? If not, then I could purchase two smaller UPSs instead of a large one, and dedicate each one to one of my computers.
Again, many thanks

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