Just been and had a look for you on vauxhall`s website for you, this is what they vauued your car at.
Vauxhall Vectra LS
2.2 Petrol 5-door Estate
4 Speed Automatic Front Wheel Drive
Year: 2000 X
Mileage: 90,000
Part-exchange Price:
Excellent condition:
£1815
Average condition:
£1605
Below average condition:
£1405
These are part exchange prices so if you were to sell it privately you should be able to get more for the car.