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Robert, the choice comes down to a 7" Mak or 8" SCT if you want something easily portable for general viewing but it comes with some compromises in terms of what you can see.
If you are really interested in deep sky stuff (galaxies) you need to step up to at least a 10" ... 13" dob, though the price is size and weight.
The smaller grab 'n go refractors eg 4" f/7 are more for those who
a) only need a small travel scope to observe very specific objects or events, such as a solar/lunar eclipses where a big scope is pointless, or a comet;
b) need a scope that can travel easily, quite possibly with a car ful of family and other luggage, or by plane; and
c) invariably have a larger scope at home for the deep sky stuff.
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