Steve Bellayr
Veteran
An M6 Classic or TTL will provide you with all the technology that you will need. Purchase one that is in excellent+ or better condition (excellent condition should be fine,too) from a reputable dealer. Start with a 50mm summicron. If in the future you will be purchasing an M9 then you might consider new with 6-bit coding. The used 35mm f2.0s have shot up in price since the introduction of the M9. The 35mm f2.5 Summarit probably is readily available. The 75mm f2.5 Summarit is a nice lens. Read Erwin Puts reviews of these two lenses on his site. You could also look into the 90mm tele-elmarit. The price of this lens has doubled to about $700 recently. It is softer then the others but for portraits it is very good. It is also very small and light.