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I think redline is pretty much the most popular choice. There are a few royal purple die-hards, but redline seems to be teh winar. I've used it in my 3, and in my MSP (twice), and I'll most likely continue to use it in future cars.
I have run Redline in a number of cars and really like the stuff. Except for my Acura which got the Honda OEM stuff... Apparently its the best stuff for it.