How long is the contract? Do you really want to be stuck on a dial-up contract for another 2-3 years? Have you thought of going broadband?
Just a few questions to think about before you make a decision. IMHO the software that comes with the MSN Internet stuff, MSN Explorer 6.0 or something like that, really sucks. Creating a DUN cuts the hastle of configuring MSN Explorer 6.0.