Hi Sidds and
mate, of the 3 scope,s you mentioned the 150mm x 750 on eq3 , but you will need a motor drive , would be the best for AP , the Mak is best for high power luna planetary viewing and the 8 inch Dob for deep space viewing. , 3 different scope / mount combo,s for 3 different aplications .
Also Astro Pete gets a very good rap here at IIS , a great guy.
He won,t put you crook.
Brian.