From an ATI GPU miner, I'm not a fan of any of those, interestingly. X11 is atm not implemented for NVidia miners. Not that I personally care, but it should be inclusive. Scrypt and variants are power hogs and stress hardware, so they are a bad idea with rising temperature.
Those PoS pools are actually scrypt mining. Buying and holding PoS coins, that may be profitable, but I'm not very very interested in speculating. I have 2 of those coins, but meh ...
Check out
http://hvc.1gh.com/,
http://dwarfpool.com/ and
http://www.ypool.net/ Here you can mine most remaining algos. Regarding low power use, I like heavycoin.