I have not skied the consumer version of the Racetiger, but I have skied the P60 World Cup GS (180), the P60 GC Motion (173), and the 06 and 07 Racetiger World Cup GS (180).
The older Racetiger and P60 World Cups are exactly the same ski. I would assume that, other than the change in radius, the new Racetiger skis the same.
However, the GC versus the GS is a different story. I found the P60 GC actually less user friendly, stiffer, and harder to get on edge early. In fact, I started with the P60 GC as my race ski because I was scared of the "World Cup" ski, but after skiing hubby's P60 GSs, I sold them and moved up to the Racetiger. The GS is pretty darn tolerant of mistakes, curls into smaller arcs with minimal fuss, rips in bigger arcs, is fast and confident in the race course, and surprisingly fun to free ski. Its even fun in up to 8" of pow.
I'd suggest the 06 or 07 Racetiger WC GS in a 170 or 175 to satisfy your needs!