Well, you don't need to go with SDSL, but 768 should be enough for what you'll be doing with it (there's also 1.1 and 1.5 available if that's needed, but 1.1=$200 and 1.5 is higher, and that assumes you're close to the CO). Their NetExpert Basic (1.5/384) Residential package is $79.95/month, for example. -Shrug-
You already have DSL service, though, so you may as well stick with that.