i belive the spirit R type A is the best of the FD's yes the bathurst was desgined to commemorate a victory and utilizes carbon from factory BUT the spirit R was the truest spirit of the RX-7 originally they desgned the car with tons of inspiration from the japanese ZERO looking through the wreckage of some zeros besides that its the FINAL Prod model of the FD..currently i have one taht does 58.4 (tsukuba) on S2 tires and only 324hp stage 2 weight, rollcage, closegearbox, triple plate clutch racing flywheel 1.5way lsd, lightweight driveshaft, GT wing, original suspention, racing brakes NO controler...i dunno what u guys think but over here in my part of SA town thats a damn good time....for a car with only 324....the FD spirit to me proves its worth...if i can only get it to catch up with my other 324 car...my NSX type R (same mods as above) runs 57.7 (tsukuba) and i cannot get the FD to hit it...yet....
FC drifts well....and is a great 200-250class car! if ur battling low power people! i just built one same mods as above NO custom gearboxes no balance controler, mAX output is 225 so far im running 103's but i KNOW its gunna hit 102's by tomorrow.....
ANY RX-7 will be good the LATER years are more controled and stable so if u want a timeattack car.....get a spirit R if u want a drifter it doesnt matter they all drift well with proper tuning! again those are my 2 cents good luck!
thats my 2 cents