I've ordered a Bluefin. I thought this was the easiest option as I've no idea when I'll change the car so the ability to put it back to stock when I'm ready to sell was attractive. Plus, for £50 they'll do me another map on the next car.
I remember being blown away when I went out in R32's Revo Mk6 a couple of years ago. I know the Bluefin won't be as aggressive as the Revo but I'm really looking forward to it and I'm sure it'll keep me interested in the car as I just feel the urge for more power after 4 1/2 years with the standard car.