Learning how to drift in a Miata is going to be challenging. I would go for a Merkur XR4Ti. It was known as the Ford Sierra in Europe. Lots of cool stuff you can get for them. Look into Sierra Cosworth if you want to see some cool ones.
4 wheel independent suspension, RWD, manual tranny available (most are manual actually) and very unique car, plus relatively low insurance I would imagine. Also see Merkur Scorpio aka Sapphire in Europe.
Otherwise I think the Cressida and J30 are definitely cool and not so common.
Oh and as for 80's BMW's.... yes, it's not too hard to add the extra letter W
...... I don't see why they would be bad to drift. 4 wheel independent suspension and good chassis' There are bushings in the rear that are usually worn out by now so replace those and you should be fine. If you can get some stuff fabbed up then reinforce the diff and subframe mounts and you will have a car that is ready for any sort of competition use.
-Sean
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At a given day and a given circumstance, you think you have a limit. And you then go for this limit, and you touch the limit, and you think "okay, this is the limit". As soon as you touch this limit, something happens in you so that you can go a little bit further. With your mind power, your determination, your instinct and your experience as well, you can fly very high. - Ayrton Senna