What do I do with 5k and the desire for an MX5

[TheGhettoPitstop]

With freelance work slowing down at the moment, I've decided to trim down my new car budget to roughly 5k. I've always had a longing for a 5 after driving a couple of Mk3s and now think it's time to take the plunge. The options out there are frightening though... Mk1 (expensive) or Mk2? Diff or no diff? 1.6 or 1.8? I'm sure you get the picture...

So what do the learned folk of the 5 board think I should get?