Saw similar type of discussions before, but the other day I just put together some lenses and randomly took a photo. Then when I look at it again, I find it a pretty interesting combo... The 2 native lenses give AF, which would be quite helpful. The 20 is kind of like a must have for many and it covers the field of view similar to a standard, and the 75 covers the tele-range and is very sharp. Then the vintage OM 50 F2 Macro gives you the ability to do tighter portraits and also the ability to do macro... and finally the OM 21 F2 gives you some fun to do MF and also a snap-shot lens... What would you choose? Anyways, happy shooting~!