Valuation on a c4s cabriolet pls.

[newbie01]

Ive been offered an 04/04 C4S cab in black with 19k miles for 53k. Is that a good price? It doesnt have satnav or pse but thats not really a must for me as i dont think the satnav is very good. It has black leather and is in very good condition. Its just had the 24k service last month and has 11 months left on the OPC warranty. Ive had an independant inspection done and it has come back A OK. Parkers website says that the value is 50k from a dealer and 40k poor but i dont think thats correct looking at the average OPC and private prices being asked (Around 55 - 60k). Can someone advise me what the glasses price for this car is (Trade and Retail) as i dont have access to a current copy. Opinions of waht i should pay would be helpful also.

Thanks.

[newbie01]

Thanks. Forgot to say it is manual. Dont want a tip.

[newbie01]

Im upgrading from an E46 M3 cab. I wanted a turbo, The girlfriend wanted a cabriolet. I cant afford a turbo cabriolet so ive plumped for the c4s cab as it has turbo looks and obviously is a cab. I think the c2 looks far to skinny and there are loads of them about which is not a plus for me. I need 4 seats too so the boxster is also out. Bit of a hairdressers car too IMO. Im not gunna track the car and im not a boy racer so 10bhp per tonne difference is not really a big deal. Its fast enough, handles well and looks nice. Thats all i need. Any more opinions on what i should be paying for the above mentioned car would be appreciated.