I'd probably just get the cheaper 38Mb and 2Mb up though first, that'd still be £36 a month in total not including any extra calls.
I want to know what is the new router like and if you need to have a separate modem for this set up? I'd rather stick to an all in one unit. Also what is the wireless signal like, I'd have to use a 10 metre cable for wired which I don't want to do.
The more I think about it, I'm edging towards just staying as I am for a while longer.