What's the best server to change to from using dial up to DSL?

Service? You may or may not have a lot of choices. It really depends on the area in which you live.

The cheapest.

Your basic options for upgrading from dial-up is either cable or DSL -- cable you'll only have one choice for provider (most likely). Cable is usually a bit faster and doesn't require a contract. DSL (in my experience) can have outages, requires a one-year contract, but is less expensive.

You may find there are different DSL providers (usually phone companies like AT&T;), but there's really not a big difference between them. Like the cable companies, they're all equally poor.