Try to find out what the speed of your connection (especially the download speed, for surfing) will be. Sometimes the provider can guarantee a speed, and if it is faster than 50K, or whatever, then it may be worth it to you. I would think that they would not offer the service if it is not beneficial, but maybe I'm wrong. If you haven't already, go to your phone company's website and check out whether DSL is available to see if they give a speed.
DSL delivery in reality can be more problematic than cable, although the constant speed is nice. I would recommend that you get DSL directly from the telephone company rather than a third party. This is because there seem to be more problems with DSL as it expands (maybe too rapidly), and it may be better to reduce the number of separate companies involved in providing the service.
For me the cost of DSL @ $40/mo. was cheaper than the cost of a dial-up ISP plus a dedicated PC phone line.