When I was searching for blue I noticed they disappeared within days, but were often marked 'sold' on the websites within 48 hours, if that.
3 that I chased went within 6 hours of going on the web.
So, I second Russ's comment wrt colours go quick.
As for price?
It's worth what they can get you to pay.
Seasons raise and lower prices a bit (more at some than other dealers).
I forget the exact date but the road tax went from beggar all to £500 plus for the exact same car around September 55 plate I think.
The lower road tax draws a premium over similar age but higher tax cars.
You can see 05 and 55 go for more than an 06 with similar specs etc.
The gasket that Jeff mentions in your other thread actually blew on mine during the test drive.
The guy had to change his clothing!
Reading up here first meant the ball then landed back with me
It's a simple and cheap (relatively) fix.
You need to go and try pre and post facelift R171 and the R172 and narrow down the model first.
Trying to look up all the mods will just keep producing lists.
Besides, the 171 has more possibilities because it has been out of warranty longer. 172's are starting to catch up.
And someone has to be first at trying mods.
Drive them and then I think you'll have a better idea of the questions you need clearing up.