Ive got a Clio 182 & a VFR400 NC30.
Keep the car and buy a CBR400 or something, something for around £1500-£1800. If you can wait till the end of the season im sure you could pick up a bargain. eBay is good for bargains if you know what your looking for in the auction, if you know nothing then maybe the dealer and warranty is best for you.
I picked up a 1989 NC30 with 52,000kms on the clock, was a ex race bike so the bike and engine are maintained really good and the engine dont cover many miles. I think the speedo is off a RC30 so that accounts for the high mileage. The bike tops out at 145mph, and does about 0-60 in about 4.5secs. Its not as fast as some other bikes on the straights, but im sure it would eat a bandit 600 on the straights, and in the right hands shock some bigger bikes too. Get yourself a nice race exhaust, a HRC (Honda Race Corporation) wiring loom and CDI, tune it up, remove the 112mph restrictor, lighten the bike by replacing the stand kit with aluminium.....and you have a ideal race bike for the road.
Why pick a Suzuki GSF600 when you could pick up something like a R6 or so..
Oh yea, bike insurance on the NC30 TPFT is £105 a year....with 2yrs NCB and passing test in 1998. Most people dont pay more than £400. A mate has a N reg GSXR600 and paid £350 TPFT.