Trek Madone 5.2 how much?

[Turbo]

I am currently wishing to sell my Trek Madone 5.2 2009 model. It has a full Ultegra SL groupset. The bike is a 58 cm. The reason i am putting this in here is because before i sell it i need a base mark price of how much it should be sold for. Its in brilliant condition and i bought it 5 months ago for £2050.

What you reckon?

Thanks Turbo

P.S let me know if anyones interested as its for sale as from now. I will re-advertise in the appropriate section once i know what i should be asking for.