To be honest, if your not worrying about photography, then a eq5 will be just fine, your not looking for a ultra stable mount, your looking for tracking abilities. Because of the eyes ability to track movement, it doesn't matter if the scope wobbles a little bit. If you don't believe me mark on this just look at shane, he runs a 12" dobsonian + all the other bits on a EQ6 which is far over rated for the mount at close to 34kgs (eq6pro rated somewhere about 24kg), yet it still tracks well.
That said if you have the ability to go for a bigger mount then do it, but if your budget restricts then just go for the 8"+EQ5.
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