Keep the 750 they are awesome!
Only reason I'm not getting another one is because I don't like the look of the newer ones and I cant get another K4/5 as I just know it wont be the same, I hated riding a friends same model 750 after I had mine setup so much for me
And its good that I have not ridden another 750 in between my accident and testing the 675 as I don't feel a power drop between them, especially with the new 675's longer first gear, hell this thing just keeps going! I am pretty confident riding the hell out of sportsbikes and I could pin this thing and there was plenty of revs left, no wonder its so rated on the road, there is so much low down usable power.
If nowhere calls me back by the end of the month for a ride on the 2011 ZX6R then I will most likely go put my deposit down on the Daytona! such a sweet deal with Arrow can, levers and QS included