You're in the right place.

Do a search for

"buying guide" it will have all the details you need.
http://www.imoc.co.uk/forums/kb.php?mode=article&k=47
Feeling generous, have a link.

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The key points are rust, rust and rust.

Sills, bottom of A-Pillars, Wheel arches, floorpan, bumper bars.

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if it's metal it will rust.

They need to be garaged and loved to survive well, or have had major restoration work done.

I have no idea on prices in your part of the world, but it is worth spending a bit more to get a car with history and that has been well looked after, or one that has been loveingly restored.

Oh, and they're not exactly

"rockets".

They're great fun, but not the fastest thign around by some margin!