T1 w/Cisco 1841 Router

I am setting up my Church which already purchased a T1 line via AT&T. We have it tunred up with a 1841 Cisco. Now I need to get a router to manage the firewall and network. This is for a small office initially and then a school in about 1 1/2 years.

I am looking for an integrated solution that will allow DNS/NAT/Firewall etc.

I guess in the older lingo I am looking for a SOHO solution.

What devices are compatibles with the Cisco 1841 and what should I get to connect to it?

We are a Church so economical is the name. My first thought was to build a domain controller that handles DNS but I thought I would first check into the possibility of an Integrated Netwroking solution.

Can anyone help?

My email is mholka@comcast.net