Tokina 35mm Macro
You didn't say what you want to shoot. For most general macro subjects, I think you will find the 35mm a little short to give you good working distance, but the lens will give great IQ. It is also a good size that will handle well on most m4/3 bodies.
You might also consider a 50mm macro. You should be able to get a pretty good one for $100-$150 used. There are great deals to be had on older 50mm macro lenses, and the old micro-Nikkors are a pleasure to use.
It's not how many pixels you have... but how you use them.
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