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It sounds as though you have come to best solution for yourself.
Speaking from experience, you would find an 80 mm scope quite limiting as your only one, no matter the quality of the optics. At the other end of the refractor size scale, 152mm scopes are large and quite heavy. There is one for sale in the classifieds with the owner saying he is selling for this very reason.
In my view, 120 to 140 mm hits a sweet spot for refractors. These open a whole world of observable deep sky objects, probably more that you can chase down in a lifetime. They are of a manageable size and do not give away much noticeable light gathering power compared with the 152mm.
It is unlikely you will see any CA for deep sky. I get a small amount of blue fringing on the bright planets, but not enough in my opinion to affect the view. The blue CA on the moon softens the focus at medium to high power in my 140mm achro, but this is easily solved with a Baadar Semi APO filter and stopping the scope down to 120mm wth a simple cardboard ring (CA becomes more difficult to control in achro lenses over 120mm). The CA is removed and the focus nice and sharp.
Enjoy and remember the best scope is the one you use the most.
Cheers
Steve
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