I was looking for an FZS 600 in March/April and studying ASKING prices on ebay, MCN, etc there doesn't seem to be much logic/pattern.
I decided on the Foxeye as it has better lights/tank range so that narrowed the field to 02/03 models. £2k should get you a bike with service history/12 months MOT, 6 months tax. If you are new to bike buying take a knowledgeable friend & don't get carried away/seduced by looks alone. A well cared for bike with useful mods like braided brake hoses,stainless steel exhaust headers,crash bungs,rear carrier is a better proposition than one that looks like a t***s handbag.
If buying from dealer you should have more protection than private sale-HPI check good idea/check details on V5 match bike/seller.
General neglect/presence of corrosion indicates bike has not been cared for. There can be a world of difference between 2 identical machines-unrelated to mileage covered.
In a nutshell: Know your budget for bike purchase. Allow for service costs if no evidence work done as recommended. Tyres? Brake Pads? Chain & Sprockets? Does everything work-lights/indicators/brake lights/horn.
If not entirely happy-walk away. Theres plenty more out there!