2008 Range Rover Sport TDV6 HSE A

I am thinking about selling my car, I have had it for around 6 months but due to the fact I work away doing 5 weeks on 5 weeks off, I don't think I am getting enough use out of it to justify having it.

It has done 51,000 miles, has all the normal HSE specs, sat nav, tv, dvd, rear dvd screens, brembo brakes etc. I also have 6 months warranty remaing with Warranty Direct

Was just wondering what someone on here with some knowledge or experience would figure it would be worth if I were to sell it?

Thanks.

http://www.rrsport.co.uk/gallery/index.php?cat=16506

Cap retail is 25500
Cap clean 22750
Cap ave 21700

I do 5 and 5 aswell and now and again I think the same way but the only thing i could replace mine for is a newer model.