For years I had a very nice 28mm f:2 AI, I barely used it, not a great wide angle shooter and wasn't using my Nikon's that much so I sold it and picked up a very clean 28 f:3.5 AI. Never looked back...very sharp and small lens, a real sleeper.
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Once I sell the 28 2.8, I'm going to likely go with the f/3.5. I use the 28mm focal length so infrequently, that my money will be better spent elsewhere.
mporter -- you'd be better off with the 28mm f/3.5 -- it's a better lens than the f/2.8 Ai. Sells for cheaper too, so your cash benefit would be higher.
Of course it is just another opinion, but I own and use all 4. 28mm Ai-s , Ai, 2.0 and 3.5. The 2.8 Ai gets little love from others, but I get along fine with it. I love the long focus throw and at infinity it is to me the same as the ai-s. The Ai-s is better up close and the 3.5 is great stopped down a bit all over. That said the 2.0 is superior and the last one I would ever sell.