Have a read of this thread, people have asked the same ? many times.
http://www.cloudynights.com/ubbthrea.../o/all/fpart/1
My advice buy the scope you will use. Bigger is better but not when you don't use it.
Quote:
Originally Posted by orestis
 hi guys i was looking for a 8 '' dob or a 10'' dob.i'd like to buy the 8'' if its better because its cheaper .which scope is better for deep sky objects i'm confused..  .
thanks in advance.
orestis 
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