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Hi Morton,
The NA140 is very light for its aperture and will (for visual) sit on a GPDX/GM8 capacity mount, but it will be at the mount/tripod limit, but it's still probably around $4K all up new with the OTA at that price. You could look at the NA130....cheaper, lighter and a slightly longer focal ratio (less CA).
If your aperture deprived (as your title suggests), I'd highly recommend a 10" dob, and if the portability factor doesnt bother you, a 12" dob. The GSO dobs sold by (for example) Bintel are great value. They're mirror centre spotted, have cooling fans, have crayford focusers (upgradeable to a 5:1 fine focus for bugger all) and have more aperture.
With quality eyepieces they'll offer you more light grab and, in my personal opinion, far better views than an 8" SCT....and for the price of the SCT you'll get the dob and 2 or 3 premium EPs...and the EPs will make a world of difference (assuming your gig is visual observing).
What's your budget and goal of your next scope?
Andrew.
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