Something like the FZR1000 is a huge bang for your buck, but beware just a little - those early 90s superbikes are a bit more of a handful than the newer thous - they're heavy and it shows. My first bike on my full was a 95 ZX-9R. Coming from a CBR250. I pulled through OK, so it can be done, but if I had my time over again I think I would have had more fun if I'd checked out some mid 90's 750s instead of the litre-class.
FZR750, ZX-7R (I saw your comment about no Kawasakis, but you're wrong you know, they are the most fun), VFR750 (R or not, your choice...), GSXR SRAD, those kinds of bikes from the mid 90s are cheap enough but massive fun. If you want to cruise a bit more than sprint, the VFR is potentially the best bike in the entire world.
Other ones to consider - RF900 (heaps of poke), CBR900RR Fireblade (the original 92 model with the 16" front is a frikken blast!), Yamaha TRX850 (not so powerful as the other big twins but the handling is worth it), Yamaha thunderarse - sorry Thunderace - (great 2-up, loads of grunt).
Keep an open mind, all bikes are fun in their own way. My general advice would be to choose something that you enjoy riding without worrying too much what others will think of it - ie. don't get a thou for bragging rights, but by all means get one if it suits you best. And remember that the grin factor of pegging the throttle in a straight line on a 'busa gets old faster than the satisfaction of stropping a zxr400 through the twisties and getting it absolutely right.
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