Update- Found this awesome article on a search. A bit technical, but the guy breaks it down for us suspension dummies. lol. Very good pictures as well to help reinforce each paragraph. My conclusion after reading this: stay moderate on the bar size and get the same size for front and rear. Thus, I'm going to go with the H&R front/rear 24mm sway bar from FS. Here's the link to the article:
http://www.stealthtdi.com/SwayBars.html