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Taking the ‘I can’t risk binning it, I gotta ride it tomorrow/home’ factor out of a trackday enhances the enjoyment immensely!!! Also if you have a trackbike with a spare set of wheels with 'wets' on (WoW) then it takes the fear of a wet one out too.
You can buy trackbikes for about a grand these days. There are several steelframe CBR600 x-race/trackbike packages on eBay at the mo for this sort of money!!
This looks like it might be a good deal too:-
http://cgi.ebay.co.uk/YAMAHA-THUNDER...QQcmdZViewItem
You basically want something with 'sorted' suspension, brakes and suspension overall are more important than HP.
Or .... Focused hire out x-R6cup bikes for £195 a day. To be honest especially when you take into account tyre wear and fuel, that is a bargain!!!
http://www.focusedevents.com/hire_bikes.asp