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While the technical aspects of optics and light are fascinating, aperture and portability are by far the primary concerns when choosing a scope for general observing (IMHO).
If collimation is touchy you can buy a better collimator and you can buy a paracorr if needed, but there's not much you can do about images that are too dim or a scope that's too cumbersome. The central obstruction gets more attention than it deserves too (for a general purpose scope).
So I think you should get the biggest aperture, in a structure that doesn't flex and moves smoothly, and a scope that's not too big to deter you from setting it up.
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