ok, main thing about ptc websites. if they pay you more than they make, the website will not last long, or it wont pay you unless you pay them for referrals and upgrades.
http://www.genuine-ptcs.com/info.php
there some info there, kinda all over the place but i hope some of it can help you understand the ptc world.
second thing, hit a couple of ptc forums where more info is available and read about each site you want to know. each person has its own opinion on a PTC but the more opinions you read the better conclusions you cant take for yourself about a ptc.
about those you asked, i wouldnt use bux.to ulness youre into ponzi schemes
http://en.wikipedia.org/wiki/Ponzi_scheme
i clicked there for a year and only got paid once, out of luck maybe
jillsclickcorner has been online for years and the comun concensus is that they are great
incentria is also paying for a couple of months
main thing is to read bro,
hit each ptc's forum also, and see what people say
good luck