At the end of the day anything from an 03 import to an 08 roadster, you will it !
Just find the best example you can for what you can afford, I wouldn't worry too much about mileage there are plenty of us on here with high mileage cars with no problems at all, the engine is bulletproof, just things like the clutch and gearbox that are the weak links really.
The cosmetic differences don't outweigh the extra tax on the 06+ IMO
Whatever you decide on and buy there will always be a better one on autotrader or here the next week, thats life