@T-Man:
If you set it up correctly - even if the ADSL modem & gigabit router are on different subnets - then you could plug in the computers on any of the 2 network routers and then it should work.
Btw, I'm using a setup like this at my church:
Netgear DG834GUv5 with an IP address of 10.0.0.2, and it hands out IP addresses from 10.0.0.100 - .254 (or actually my MikroTik does it to have better control)
Then my MikroTik RB750 is connected to the Netgear modem, where my MikroTik has an IP address of 10.0.0.3 on the port that goes to the Netgear modem, and an IP address of 192.168.88.1 for the other 4 LAN ports.
The Netgear modem is dialing my primary ISP account, but I can still dial ISP accounts from my MikroTik too. When I connect to the Netgear's WiFi AP, I get a 10.0.0.* IP address, and I can still access everything on the Internet & on the 192.168.88.* subnet.
The same goes for everything connected to the MikroTik, which gets a 192.168.88.* IP address, where they also have access to the Internet, as well as everything to on 10.0.0.*
@2old4this:
If you get a Wireless N router with MIMO support and multiple external antenna's, then I suppose you should get like 30m inside a building. You really can't tell what the distance would be until you've actually tested it! Outside is a different story.