Looking for a router recomendation...

Hi all, how's it going? Ok, I'm setting up a network for my church and I want to have two parts of the network, an administrative side which will contain a member database and other databases that I obviously want to keep secure.  The other side of the network will have a 12 computer lab and a wireless AP.  We have DSL coming in for the Internet and I want both sides to have acess to it.  

I'm envisioning a router that will take the Ethernet link in from the DSL modem, and shoot out two seperate Ethernet links for the two sides of the network I want to have.  Of course being able to block the two sides from seeing each other.  I have a Cisco 2600 at work that does this but that's out of my price range.  I'm thinking sub $200-$300.

So does anyone have any ideas about an affordable router that'll do this? Or a combination of devices that'll do this? I know I could probably set up a Linux box to do the NAT but I'm not going to be at this church forever and I need something that I don't have to worry about the next person that's going to come along and have to support this.  It's much easier to leave instructions for running a firmware update from a web browser than doing anything on a Linux box, at least from my experience...

Thanks!