I've started mining at rfcpool which just switched to PPLNS with 0% fee. I've checked out quite a few pools and to be honest, this site looks like it's run by someone that knows what they are doing. The coders hang out in their irc channel, which is a plus.
I'm mining there now as well. So far I'm getting more BTC/day than I was on BTCguild. I agree that the site is well done. Simple yet functional design that supplies me with all of the info I care about. It's fast & secure and there aren't any ads. Doesn't seem too popular just yet but I think as more people check it out they'll gain some traction.