Buying my first RX7,some guidance would be appreciated!

[bonesy]

As the post states im going to buy a rx7 but...

Coming from a 323ti bmw what model should i get?
i am in the uk so think i will import from japland as its cheaper,plus the uk models are classed as a 2600cc not a 1300cc like jap imports are...
What do i look out for? Is there any tell-tale signs that the wankel engine is dieing?bodywork im not bothered about as i work at a body repair shop,but i dont want to have to pay an extra £2500 for an engine when im spending £5000 on the car!!
Finally i have been told not to run the rotary engine on any fuel less than 98 octane?what do you run yours on??
Many thanks in advance