Much debated topic elsewhere, I've seen some hilarious threads on other forums, particularly ones concerned with noise reduction (the lengths people will go to, I tell you!). People seem to underclock things to make everything nice and quiet and save that last 1/4 decibel and I'm speiling now so anyhoo,
Yes, the S-flex seems to be generally considered a great choice, being powerful and very quiet, although I have heard numerous reports of clicking noises. I'd say that would be a good choice, but if you are in a researchy mood, go to an online shop, find one you like the price and looks of, and search reviews online!