Selling my Boxster? Help please!

[Craigp]

Hi folks new poster and hoping you can help.

I have an 04 plate Boxster, seal grey with 18inch carrera wheels and hard top.
Now, how do I know if it is a 986 or 987 model??? I'm not that well up on cars and was'nt sure when someone asked ie insurance is it 2001-2004 or 2004 on....registerd May 2004.

Also, not sure how much to sell it for it has ..CDR-23 audio system, Porsche sound pack and amplifier, wind deflector, cruise control, on board computer, top tinted window, park assist, dimming mirrors, automatic air con etc...
Help most appreciated! Oh and if anyone knows anyone that would want to buy one it'll be on autotrader very shortly.

Cheers