After a load of research and a quick chat with Red16 from passion ford.
Have conculded the best option would be.........
RX7 FC3S
16" fan
Civic Rad 92-00
Pics from Red16's build
My only real worry is the fact that the civic rad might not be able to handle the load form the RB25DET. Not sure what i can do apart from possibly install a 2nd radiator somewhere or two oilcoolers to help bring down the temps a little.