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I'm using Castrol Edge right now,because I'm a sucker for the hype.
Castrol claims 8x less wear than Mobil 1 ,and people claim a C5 will go 200k on Mobil 1,so I figure with Castrol,I'll get about 1.6 million miles out of my Vette.
At the rate I'm going,I'll need to live to be about 136 before I'm sure about their claim.
But seriously-I'm using Castrol right now,used RP last time,and I'll probably use whichever premium Synthetic I'm in the mood to buy when I'm oil shopping-They're all good.