Motorcycle and Scooter appreciation

Thanks very much for the honest thoughts.

My intention to move up the cc ladder is as I've mentioned before, to sell the ZXR 400 get a more modern and powerful bike with it hopefully not costing me much. My bike is an '89 and swapping it for a '99 model is very temping. It's interesting you say about the 750, but there is a part of me that likes the idea of moving up the cc ladder slowly mastering each platform first. I'm a Honda guy everyday of the week, but a good CBR 600 RR would cost me £3000(?) and that's out of my budget.

For reference

1989 ZXR 400 H1: 61HP / 163kg (dry)
1999 GSXR 600: 92HP / 174kg (dry)

Thanks again for all the opinions, really useful.

How about the kwak 600/636? Yamaha thundercat or R6