On the topic of ISPs being invasive chodes, well... you likely have anywhere from 30 to 100 ways per month to indicate your distaste for that practice. I have worked for two ISPs now. Once, we instituted a ban on outgoing SMTP unless you owned a static IP. The intention was to prevent the unintended distribution of spam from all the many, many, many zombified clients we had. Several of our customers let us know what they thought of that policy, and management was forced to consider the opposing viewpoint. At my last gig, we didn't filter, period. Having worked alongside a lot of techs, I can tell you, we as a general rule have absolutely no ambition to snoop on or molest your data -- and are usually opposed to any such suggestion. If your ISP does otherwise, call them up, cancel your account, and tell the operator precisely why you're leaving when they ask. Encryption is the wrong solution to that problem.
forgive me if I offend, but I'm guessing you know nothing about american isp's and the monopoly they now have. almost none of us, now, can choose our isp anymore! the local governments sign contracts - exclusive ones! - that lock us into ONE isp per area. ok, two, if you consider cable modems vs dsl; but cable modems won and dsl is quickly dying. so that really gives us one choice: the cable company. are you seriously believing that we can change isp's? and given that they are all mega-isp's now, none of them vary all that much. and all are going to give-in if there is a NSL put out in your name. not one of them will buck the system.
in fact, I run a vpn, daily, and this hides what I do from my isp (comcast). and yet, when I run the vpn, I find that my connection is killed after a few hours, requiring the modem to be rebooted. when I was not using the vpn, this didn't happen. comcast is hostile to non-business users and employs dpi and is damned proud of it. my vpn thwarts that and it pisses them off. so, they try to punish me. of course, I have a work-around (auto detection of my default router being unpingable and then I launch a job to reboot the modem, log the event and carry on). but still, they are hostile toward vpn users. should I switch isp's? of course. but CAN I? not really.
20 yrs ago, we had choices (in the US, at least) about isp's. there were many mom-and-pop small shops that offered net connectivity. now, they are all swallowed up by the big guys and the big guys are all run but evil bastards. the techs are not evil. they are just techs. but the BUSINESS GUYS are all nasty assholes and they are the ones who dictate policy.
you or I threatening to 'leave' will just make them laugh.
encryption IS the solution. I find it so strange for anyone to argue AGAINST online privacy. what the HELL, people??