StopTech : Balanced Brake Upgrades
Brake Fluid Comparison
ATE SuperBlue is nothing special, but it's decent, and considering it's cheaper than most, you can't go wrong with it.
Otherwise, the Brembo LCF 600 would be very nice, but impossible to find, at least it was impossible for me. I would use it just because the calipers are Brembo on my car, to match
Motul RBF 600 and RBF 660 are also good, not very expensive, so it's a good choice. Put both(not at the same time, but first was RBF 600 and about a couple of months later, RBF 660, don't ask why, stupid me) in the E46 M3. Good stuff.
Best option, Castrol SRF. Only sold in 1L bottles, but quite expensive. I found it at a great price in my own country so I went for it. Great stuff, best you can find, but at the same time, most expensive you can find