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Hi Mario,
I work in an astro shop, so take everything I say with a grain of salt. The general rule of thumb is 8" and up of aperture is getting serious for deep sky. From the Lostock site back in January (I had an 8" LX90 then) I went galaxy hopping in Leo and Virgo, and saw everything the scope said it was pointing at.
5" vs 10"?? Well, the 10 gives you 4 times the light gathering power (not exactly, but again a good rule of thumb).
Brands, of course I am going to say Meade, but I freely admit I am very biased, coz thats what we mainly sell.
An 8" LX90 is powerful yet still very portable. The 10" is still portable, but not as stable. The 10" LX200R is as big as you would want to go. Above that, you would probably need 2 people to carry it.
Clear skies,
Shane
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