Ooo one of my forté's..... (now i can help back as much as you guys have helped me).
What will you be doing with your new broadband? what kinds of uses and how much 'usage' do you think you will have.
Do you understand how broadband works and how it will vary from supplier to supplier? checkout the guide
here at adslguide.org.uk. Basically BT Wholesale take the connection from your house through the exchange then to your ISP's network, your ISP then connects you to the internet. Just because the backhaul is supplied by BT Wolesale, doesnt mean BTBroadband is the best choice.
If you're still on dialup I would suggest starting on one of the lower speed products (512k), especially as BT now have this working so most phone lines can take this speed, higher speeds are totally dependant on how long your line is and how good a quality it is. It's worth remembering that broadband doesnt work like dialup and is static to your physical phone line it is an always connected service.
ADSL is a contended service, i.e you actually share the connection with upto 50 other people in the exchange, and why speeds are advertised as 'up-to 512k' etc. At busy periods of the day you may see considerable slow down in the connection, this contention occurs regardless of which ISP you use, but is still something to be aware of.
You need to sum up the following:
Can I live with a usage cap?
Can I like with a long contract?
Do I need more than one PC online?
How much am I willing to pay?
Beware us usage caps, long contracts, leaving fee's, 'musy buy our hardware' clauses.
ISP's I wouldnt reccomend:
AOL - 12month contract, notoriously 'slow'. AOL's email is very picky about what email it delivers and often blocks a lot of legitimate email. The AOL software is a pain to remove from the PC, but now apparently is no longer required for use however takes a fair bit of savvy to connect in this way. They also dont allow you to have more than one PC to their broadband unless you buy their own expensive equipment
Bulldog - Bulldog are an LLU supplier, they have their own equipment in the BT exchange that you are connected to, this also includes your telephone calls. My friend works for BT and explains how bulldog often blame BT and get BT to investigate first, to then be told it's the Bulldog equipment etc, and can leave end users with long periods of downtime with no internet and no phone line.
UKOnline - Another LLU supplier, this time only the broadband is supplied so they dont mess with your phone, however the sting of a 12month contract, and as reported on user groups they have a lot of customer service issues as well as poor speeds.
Tiscali - AVOID LIKE THE PLAGUE this 'ISP' and I use the term lightly, have notorious issues with billing, speed issues, (I know several people with worse than dialup speeds at the moment who are on products that are supposed to be 40times faster), they also lock you into a 12month contract and do not support the 'migrations' system that allows people to move to a new broadband supplied, you need to cease the broadband and order a new one!
My Reccomendation:
Zen - My suggestion is a company that doesnt advertise, most of you have probably never heard of before, yet year after year they get awarded Best UK Broadband providor awards. Zen is to broadband as Lotus is to handling. They just have it spot on. Zen have a 1 (one) month contract, they support migrations so if you really dont like it you can just leave when you want. I moved to Zen (from Tiscali) coming up 3 years ago, and with a 1month contract I thought what can I lose, and I'm still here. They're consistently rated highest in speed tests, and reliability is amazing, I think i've had 3 problems in 2 years, 1 was a BT line issue (yay to the big lorry that took out the pole!) 1 was a BT exchange issue, and the 3rd was a small hiccup with a server at Zen which was resolved within the hour. They're not the cheapest around, but I prefer to pay a little extra for a quality connection that just works. They have very quick install times, and the technical guys know exactly what they're talking about.. I need say no more, the adslguide comparision chart
here says it all. the one last thing is thier flexibility with payments, credit/debit card, standing order, CHEQUE or if a business a credit account.
http://www.zenadsl.co.uk
Hope that wasnt too much to digest and helps.