Back from Motorcycle World near Worcester and have booked a test ride on both the 600 and 750 for next week after they have transferred the bikes from other branches. They also have a couple of older (K5-K7s) bikes so may take those for a rag to make sure it's worth coughing up the extra for new.
Interesting surfing the net you can get a GSX-R1000 for less than a 750
Subject to either bike riding better that my CBR600
I will see what deal can be struck.