Dsl speeds can vary depending on the distance the cables run from the house to the phone company switch. The phone techs working an area can tell you what's a realistic expectation. At our house we're paying for 10 Mbps and typically it achieves in real performance about 8 due to the long distances involved. That's megabits per second. Less remote houses in this area can get 50.
FYI the phone companies can bond multiple Dsl into a single higher capacity connection, so if you find a property you really like that's dsl you could look into the cost of that. Might be worth it in your situation.
