whats my car worth.

I have the following car and im considering putting it up for sale and i am unsure of what it is worth in today's market so can you give me a sensible and constructive guide to what you may think the current value would be -

Saab 9-3 ss aero, 03 plate, 71000 miles with fsh, Steel grey paintwork, Dove grey leather interior, 230 bhp hirsch remap, maptun 100 cell race cat, maptun exhaust, bsr induction kit, do88 intercooler, pagid discs and pads, toyo tyres, also new top mounts, track rod ends, arb stability links, timing and balancing chain kit, 6 months mot and tax.

thanks for your help in advance ;ol;