If any of your ISP's support ADSL2+ technology then definitely go with that... a month ago i went from 1Mb/512Kb (ADSL) to 15Mb/1Mb (ADSL2+) with a new ISP and I can't be more happy with that... the cap is basically like when everyone went from dial-up to ADSL... the pricing is actually the same (additional features cost more of course)...
you wont regret it when you can download with more than 1,6 megabytes a second...