ISP Tracking

in short yes. It is always safest to surf through a proxy and if you do alot of downloading/uploading then a seed box with FTP and a dedicated ip is the safest way to prevent your home ip from being tracked.

Check out these seedboxes that come with a proxy included

http://www.xirvik.com/semidedicated.html

these boxes do not include a proxy but have smaller cheaper packages and the options for 15 day payments instead of monthly:

http://rapidpeer.com/seedbox-package-prices/

and there is always the option of typing proxy in google and finding a free one(usually slow speed). But you won't find a free seedbox.