Think front bake "systems" (disks, calipers, lines and MC). I have heard of GSX 1K full swaps, Kawasaki full swaps, then Brembo and Behinger (spelling?). My experience is with Brembo, which is an amazingly effective fix. You can also go to a 320 mm disk with spacers on the calipers to accommodate the bigger disks. Not sure of the value of this but if you turn your disks red hot on a regular basis this might be for you. On the Brembo the 108mm are about $1,200, the HP's are the gold standard at about $2,000. That's just calipers!
The biggest thing I noticed with the brake upgrade was not all out stopping power but control. I now brake with just one or two fingers. You can feel the tire on the ground, and trail braking deep into the turn is very easy. Feel is amazing and you feel much safer.
I'm pretty sure you know all this though GNBRETT. Good luck with the upgrade and don't forget lots of pictures. Let us know what you are considering and why you made the choices you make.