Amazingly large proportion of people on forums that are 100 or so metres from telephone exchanges
out of couriousity you picked that deliberate or just lucky?
I was going to say ask for feedback from ntl peeps in your area since ntl is a area dependent some areas are good others not so good, and your distance from exchange which you just confirmed is very good.
If you can get LLU I would go with adsl, if not probably cable.