without a doubt the RX-7 is the best of the bunch, the MX-5 is considered a great entry level sports car, but it has always been underpowered, the RX-8 is a little confused as to what it is supposed ot be, but it has a great engine.
@junaid_A
i hope you realise that the MX-6 is just a rebodied ford probe. which 2.2L are you reffering to? the F2(120hp)? or the JDM F2T (145hp)? personally i'd rather have either of the KL series engines (2.5l 174-200hp).