Hearing some good info so far, but I'm getting conflicting answers lol (kind of expected that). Please do post any ram recommendations along with your 2 cents though, as I had said the main problem has been mostly just singling it down to a good set for 8gbs.
As to the comment about not using more than 4, usually, I would have to agree for normal every day surfing and email, casual encoding, etc, it's great, but the real reason I'm going for so much is because of the ridiculous recommended specs of an upcoming MMO title. Here, check it out yourself, http://www.finalfantasyxiv.com/media/recom/na/pc.html
Scoring very well on the benchmark for this program can be quite a pain and also I'm trying to future proof my system to get a few good years out of it before swapping in new parts, aside from the new Bulldozer processor probably..