I don't think you're living in any sort of fantasy world at all, especially because you seem to like stainless. you could definitely find a mint condition Geneve auto in that price range.
Heck, my friend Mike just sold a near mint Constellation with a cal. 721 for ~500 bucks.
Have you considered other brands of vintage? I'm thinking specifically of Longines. You can find a MINT Grand Prize in the 350 - 450 range with little trouble. In-house movement, highly collectible, yada yada yada
Also, look for a cal 343.
Girrard-Perregaux and Tissot are other options. Especially Tissot for you since for many years Tissot basically = Omega.
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