For goodness sake don't go for anything but the NSR. All the rest are four stroke bikes and get 0-60 slower than my Peugeot 106 and won't top 70mph.
Your best bet is going for a restricted NSR since you only have your CBT. When un-restricted the NSR tops out at 120mph and gets the 0-60 run in 5-6 seconds depending on how you unrestrict it. As long as you don't mind it sounding like a bee in a jam jar, it still looks the dogs.
If you are not looking for a poser bike and something to learn on the CG is the best bet as it has that Honda reliability and if you manage to bin it (highly likely at this time of year, I've allready binned my bike once.) you won't have to shell out 500 quid for the carbon-fibre fairing, like me.
I don't know much about the SR but it looks like a CG without that Honda reliability and the CBR is much maligned througout the biking world as the very shoddy replacement for the NSR. If you can afford it I would also go for fully comp as you'll need to get your no claims rolling.
Oh and final advice really do get all the right kit as I can tell you from personal experience sliding down a road a 30mph is no fun, and I would have been dead without the leathers.
Oh and the most important thing, have fun
Here are the bikes in order of greatness:
What I have, good paint too.