That car is bog standard though.
The wheels and the exhaust are worth £2k on their own in my opinion. I'd take them off, sell them for £2k, buy some RAYS for about £400 and then put the car up for £8k with a view to taking an offer or possible reducing it over time.
You may also want to swap the bumper for an oem one also, to bring it closer to stock...I'm sure someone with a sunset would want that V2 bumper.