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In any case from experience I say you won't be happy with anything under 6" of aperture. I have tried scopes starting from 40mm to 250mm and currently own a 80mm ST refractor, a 6" EQ newt and a 10" GS dob and can tell you that my most used scope is my grab and go 6" Vixen on a modified EQ mount (to use in alt-az mode). I had a 4" ST refractor for a while but the views were not substantially better than the 80mm. I subsequently sold it off. You really start to see good detail in DSO's (especially globulars as they are resolved, some to the core and not just smudges with some periphery stars coming through) and it has been said that the minimum size for satisfactory planetary observations starts at 6".
Just my 2 cents worth.
Darren
p/s: small scopes are great for on the whim observations but do not make great only scopes.
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