Trying to connect 2 locations to server

I am trying to figure out what sort of service to choose for a simple 2 location network less then 5 miles apart. The main location will have: Server, Desktops & Terminals. Working on windows server OS, using MS Access Database, also requiring Internet access for all users. The second location will be working from the Access Database on the server, along with 7 desktops & 7 Terminals also requiring internet access.
Now I am trying to decide bewteen DSL (But am unsure if terminals & desktops from remote location will be capable of performing this) or ISDN w/ Internet Access?

No equipment has been purchased yet, so any references are gladly welcome.