SnowMunki - Following on from John2007 about what speed you could get, if you know how to get your line stats, (SNRM and Attenuation), feed them into
here.
If you don't know how, ask again and we will help you on that.
Re possible suppliers, you have already had the best recommendations from the others, but you could also look at the Compare menu item on the left of the home page of this site.