hello
you can have even a router with advanced enterprise IOS.first of all i'm not aware of your set up.
i'll explain 1 scenario which i did, i have a 2821 router at the H.Q and 20 branches at remote locations. at remote locations i'm using cisco 877 advanced ip services, i'm using EIGRP routing protocol.
let me know if you need a sample configuration.
pls rate if it helps.