Ignoring the old DND alignments, I'd say the Sniper's credo from TF2 sums my default play style up well. "Be polite, be efficient, and have a plan to kill everyone you meet." If there's a peaceful solution, I'll usually go for it. I'll be civil to everyone who isn't actively obnoxious. I'll help the poor just for something to do, but anybody with a fat coin purse had better be willing to part with some of it before asking my aid. But every so often, some people just need an ax to the face, in which case I'll deliver it as soon as an opportunity presents itself, with the only mercy being a swift death.
Although, like Keyrock said, sometimes for a change I'll pick an interesting faction/religion and make myself a paragon of its credos and goals. It can be fun to work within constraints like that, and the PE Paladin class, from what I've read, sounds perfect for such game play.