Why do you need a VPN? If authorities want to go after you they can figure out what you are doing from traffic pattern analysis, they don't need to read the information being transmitted. If it's about the letters provierss send sometimes, if they send you one, find a new provider, or worry about a VPN then.

All VPNs do is give you the illusion of being protected while taking your money. They will not deter a determined attacker or the authorities, not that torrenting would be a big deal anyways.