well i can tell you what i like and what i have used here is a link to my build remember this is after 15 years of doing this, i did not start out this way.
http://www.tomshardware.com/forum/274855-29-experimental-radiator-build
i like the 655 series of pumps
i like the tube style res
i like thick wall tubing 3/8ID 5/8OD i did not get it because all of my fittings are 3/8ID 1/2OD and i did not want to buy all new ones
i like copper blocks thay seem to work well
but this is me, you may have different tastes then me. The bits power res is what I own, chemical resistant tubing lasts longer than other types, I am currently using norprene tubing to see if it lasts longer than the chemical resistant, and the 655 series pumps give me a solid 5 years at 24/7 operation.