Oh god, don't touch the Police ones.
I've heard stories from Police mechanics that who put you off ex police cars for life. Sets of brake pads every 5,000 miles anyone?
Yes, they've been well maintained, but you've also got to factor in that they have almost certainly been used much harder than say a fully spec'd Elite that has most likely only pottered around the motorway network. The police ones also tend to come with quite a depressing spec.
Just get an elite. I don't know why anyone else would bother with anything else.