:!:They can slow down your connection if ur in the high user group.
So in that case they must be snooping on what your downloading in the first place. Most ISPs throttle the ports that the P2P networks use and not your total bandiwdth, so your Email and Web Browsing functionality are not affected. How do they do this? Well they do packet inspection to find out what's in the headers of each packet heading your way, hence they are already looking at your data otherwise how could they tell what is web/email and what is P2P data.
Anyway all mines encryptes, can read it even if they wanted to... 
What exactly do you have that's encrypted? Yes you can run the torrents on an encrypted transfer, this means that it will be slow anyway as you need to find someone that is encrypting the data in the first place, so your P2P network becomes really small and therefore less data available = slower downloads.
Your email server may be a secure server of one form or another which would mean that your connection to it is encrypted, but if your on the surfing the web, most of what you surf is not encrypted. In fact I would bet that unless your using personal details such as Debit/Credit cards then you won't have any encrypted data. Most onlines stores these days allow you to browse the items and the site only becomes secure when you go to pay.
Not having a go or anything of the sort, just hoping that your not under the illusion that all your data is encrypted.
