[OM] f/2 vs f/2.8-which are better?

[alpinist]

Which are the better Zuiko's to have the f/2 or f/2.8 lenses?  I shoot 
landscapes and work on a tripod, so speed does not really matter.  Are the 2's 
better lenses than the 2.8's? or just faster?

I was looking at the 24mm and 100mm focal lengths and  a search of OM mt lenses 
came up like
New Vivitar's around $100
New Sigmas around $180
Used Zuiko 2.8 around $200
New Zuiko 2.8 $300+
Used Zuiko 2 $450
New Zuiko 2 $700

Hold out for new 2's or would something else cut it?