I've got a 10" GSO Dob and absolutely love it! She'll perform nicely to well over 400x in good seeing, she shows me alot and frankly, 10 inches is a perfect compromise between light gathering power and portability. The OTA (16kg) is easy to carry in hand, I can fit it into a station wagon with ease and 10" aperture will blow you away at dark sky location. Oh yes, the
ORION NEBULA is sensational from my light polluted locale. You can see intricate detail in the core in good seeing and it is very bright
If price, weight, portability are an issue, get a 10" GSO. You can't go wrong!