Hello and Help! Please

Hi
Great site BTW.
I'm considering buying a Discovery, Y-01 plate, man, TDS E 5, Montecarlo Blue, Grey Cloth int, sunrf, rad/cass, fsh, 1 yr landrover warranty and recovery, 47,000. Privacy windows -very good condition. How much should I be paying?
I've done a few searches and the only one that gave me a result was autotrader at £15,000 - £17,000.

Any help is most welcome.

Many thanks inadvance

4BY4

I looked at a y plated td5 earlier this year and it was £11995, i couldn't say wether or not thats under priced though..