Sounds like a nice one.
It's about as late a one as you'll find at any rate.
Deffo check it for rust, there's probably some on it somewhere.
So if you can't find any, snap it up, especially for that dough.

I paid £8500 for mine five years ago, but mine was low mileage, mint, black, one owner with 6-7k worth of recent engine build/install and 2.5k worth of brand new brake upgrades, so sort of a bargain - sort of

I hardly ever use the old girl, but she still seems to be on a determined mission to deteriorate -

she's currently sat locked in the garage looking very sorry for herself with a flat tyre, a smashed headlight and a rust bubble in (of all places) the gap between the bottom of the O.S. quarter glass rubber and the top of the quarter panel -

So - even the best ones rust (deep joy, window out, interior out, panel cut welded and painted/blended, and then put it all back together ) So prepare yourself, you will probably have to spend time, effort and money keeping her right.

Should be worth it though, and if that white one is solid and honest, clean inside and drives right, you should be onto a good thing.

I knew mine since it was a toddler - less than 3 years old and standard apart from a crap chip and watched it develop into an animal over an 8 year period and when it was just right, I bought it - and i've been regretting it ever since

You'll see if you get one - it's a sort of a love hate relationship

In my humble opinion, don't put 6 x 9s in the shelf unless it's already got holes that need filling - if your back window doesn't get put through by some piece of sh*t stealing your nice new speakers, the shelf will sag, and you'd be amazed at what will devalue a car -
your better off with some nice custom fit units and a base box in the boot - you can take it out then when you want.
And anyway nobody need know that you've got anything worth nicking in the car, coz it won't be visible.

Oh, and IMHO, don't fit a dump valve unless you :-

A) Want your car to run like a bag of sh*t.
B) Want your car to sound silly
C) Want people to laugh at you - apart from 15/17 year old chavs/neds who will
look on in awe struck wonder.

Or
D) Have enormous horsepower and the car requires one and is set up to use one.

Anyway, that's enough waffle from me.
Hope it's a minter and that you get it for the right price.