Any websites with a guide to Broadband useage?

I'm looking to change ISP. I currently send about 30 e-mails (max) a week, download no games, or music, or video and surf the net for say 4 hrs a day (again Max)I also don't play online gaming.
I'd like to work out how much BBwidth I use as I might as well be capped if the service is cheaper. I have had tautology on but have been warned about its accuracy. Ideally i'd like one of those sites which says if you do this, this and this you need this...
You know what I mean!!
PS Am looking at 2gb at zen and 5GB at waitrose and cannot decide!!

  VoG II 16:39 09 Feb 07
  Technotiger 16:40 09 Feb 07

Many thanks!! Cooking tea now but will check out the suggested sites later- much appreciated :)

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