It depends on how your ISP is going to throttle you. Comcast checks the headers in the packets so no matter where you are connecting, they will see what kind of traffic it is. That is why encryption should help you with them.
Comcast uses sandvines that impersonate a conversation from a peer to a peer.
For example, I post a torrent and my ISP is legit like verizon.
A peers bittorrent makes a request to my pc via bittorrent. My client/pc sends the message back that
I am available and can transfer data. Basically allowing the connection of both pc's through bittorrent.
What Comcast does is employ Sandvine technology which targets the requests, acts as my computer
to respond to the request for data transfer, replying that I am not available to the other peer and if the peer has comcast and I don't it works in reverse.
The fcc is going to investigate comcasts activities.
Here's a few links.
http://www.techdirt.com/articles/20071019/115242.shtmlhttp://www.nytimes.com/2008/01/09/business/media/09fcc.html?_r=1&oref=sloginSupposedly there are a few patches/fixes to get around it.
But, once again I have to say, I have comcast and had this problem a few times and it never returned.
I seed all the time without interference now.