I'm presuming you haven't test ridden any of these yet? I'd suggest riding a few bikes before deciding on a make / model to buy.
The VFR's are a more sporty riding position, but with a wide tank, and decent seat I find my VFR more comfortable than other bikes I've tried, also more fun than some of the bigger bikes. Grip the tank with legs, no weight on wrists, and it's capable if you want to throw it round the twisties to have a bit of fun on. I've had my old 750 for years and still can't part with it, having replaced it's stable mate several times trying to find something else, as an all round work horse I love the VFR.
As for suggestions for another bike, I have an '08 FZ1S, and whilst it's pretty quick, it's dull as dishwater to ride. Bores the heck out of me, so the VFR still sees more use. For legal-ish fun, naked twins are good. I miss my KTM Superduke 990R, it was hilariously naughty, only 112BHP at the wheel but light, narrow, it was like a 125 on steroids.
Terrible as an all round motorcycle though, and not fun in the colder months.
Kawasaki ZZR's are similar to the VFR, the 600 is quite good fun, though I didn't find the handling as good as the VFR.
Kawasaki Z1000's are a giggle, might be too much for your first big bike though, and depending what sort of riding you will do, a naked / semi naked can be miserable in the winter, I find myself staying significantly drier on something fully faired, and also warmer.
Work out what you want from the bike, and do some test rides first, before narrowing down what you want, then get 2, 3, or even 4 bikes. Because 1 is never enough