A couple of additional tips and generalizations:
1. On the router set UPS, and it should serve ONLY the router, well, MB modem to the load.
The reason is simple: a thread of a server capable of viewsat battery in 20 minutes, and electricians in our country can reach two hours...
2. The combination of Ethernet+wireless ISP or ADSL is more reliable: Eternalise — both the main and wireless or ADSL — as a backup.
Let me explain why: stupid wired providers there are routers in the end in case of light there is a chance that they, too, will get... And wireless and ADSL — are located far from home and a chance that will fall and they are only covered if the whole neighbourhood or city!
3. ADSL too slow though, but better as a reserve: MGTS is the rate of "backup channel" — easy 20 rubles per month + the number of days that you this channel is activated.
Canal through WiMax, 3G or WiFi — you have to pay constantly, you use it or not, because activation of the "per diem" rates they are doing in manual mode!
4. If you decide to use for routing, not the router, and a server — it is better to take something like a laptop simple: in Linux in the terminal mode of an old EEE 701 was extended to the native acre to 12 hours avtonomki!!!