I think if I could have any 2 bikes, I would discard (or pass to a friend) the one currently in the garage. I would go for the GSXR1000 or maybe 750. But, before I would, I would test ride a RC51 to see what a twin would be like (who knows, I might love it!).
My second bike would be a sport tourer that my wife would not mind getting on the back without too much discomfort. I would like it to be a VRF800.