Re: danger from country of origin
The fun part about that is that, while the NSA "promises" it "isn't" snooping on Americans, it's perfectly willing to snoop on Brits. Meanwhile, MI6 isn't supposed to snoop on Brits, but is perfectly willing to snoop on Americans. And of course the NSA and MI6 are best friends, so they're perfectly willing to share data with each other.
All of that said, it seems most of the stuff around PRISM, once you cut through the hype, is actually a that they're tapping long-haul fibers and dumping the data they get from that (along with anything they get through the normal one-or-few-users-at-a-time court order procedure) into a big, queriable database under their control.
While I applaud your efforts to protect yourself and your clients, make certain your encryption uses some variant of perfect forward secrecy, or else once they crack your private key (and they will, eventually) all of your encrypted traffic that they've been storing over the years will be their playground.