why would an FM2 be a worse choice than an FM2n? Isn't the only difference the flash sync speed (and the fact that some FM2n models did not have a titanium shutter)?
Also to the OP: If you decide to go with primes the 105/2.5 is fantastic. And I have used the 24mm/2.8 which is also great. A better choice than the 28mm/2.8 IMO.