Too many options.
Try here to see what suppliers you get get first of all.
http://www.broadbandchecker.co.uk/
http://www.moneysupermarket.com/broadband/enquiry.aspx
http://www.broadbandsuppliers.co.uk/compare.php
A lot depends on whether you can get cable or not, even sky can be a good option for some.
There are a lot of mobile phone companies doing "all-in deals" as well so it depends on your circumstances as to the best overall price.
You can compare potential suppliers here
http://www.broadband-finder.co.uk/compare-broadband/compare-broadband.html but the results look too good for everyone.
http://www.broadbandsuppliers.co.uk/compare.php as well.
Speak to your neighbours to find out what the real speed you will get, it will be less than that quoted for the package for several reasons, to make sure you are not paying for a package which can't deliver the performance.
I would guess if you have got by on dial up than you are not downloading much so a basic package is probably OK but think about what you might start doing if you go mad with BB.
You are usually stuck with paying BT for your land line unless you can get cable, I think some mobile companies incorporate it into their deals somehow, not sure of the details.
As a rough rule you will get a better deal if you bundle the BB in with another item. You can usually bundle in your BB with a phone call deal of some sort, free calls for some or all part of the day for example.
See I told you too many choices, take your time to get the right deal for you.
