As if the G25 wasn't dreamy enough, Logitech releases an evolutionary improvement in the form of the G27:
Quick Overview of differences from G25:
Buttons on wheel face: G25 has two, G27 has six
Force feedback transmission: G25 features straight-cut (spur) gears, G27 features diagonal-cut (helical) gears
Pedals: G27 features taller standoffs for clutch and brake pedals, as well as horizontal adjustability, making customizability and heel-toe downshifting easier
Shifter: G27 features stiffer centering spring and more positive gear engagement feeling, improving the overall feel of the shifter.
RPM/Shift Indicator LEDs: G27 features 10 LEDs that can be used by game developers to indicate RPM, redline, or to indicate the user should shift gears.
Current G25 retails for about 12,500 petot, this one goes for around 14-15k.
Sadly I can't afford either of them. The Logitech Momo is good value though, got mine for 3,600. No clutch and manual shifter, no 900 degree rotation, but it does have the same precision as the G25. From what I've read though, potentiometers on the pedals of the Momo break easily. Had mine for 10 months now, still works well.