Newtonian scopes only for imaging

[TareqPhoto]

Is it a good plan to buy only Newtonians for imaging?

I was thinking what will i get if i bought 3 Newtonian scopes?

I was thinking about which 12" scope, but then after long long thinking i decided that 12" [~300mm] F4 is the best choice for planetary, because i have already 5x Powermate, so if i got F5 then it will give me F25, it may be too much even it will give me longer focal length, but is it really too much or enough to have 6000mm for planetary anyway? And from Tele Vue site, it shows that PM 5x can be gone up to 7x also, maybe i can work for that then, F4 version is very slightly less weight than F5 version but still heavy, maybe that is good enough.

And for another Newt for DSO, i was thinking 2 small Newt, they are lightweight, so my mount can handle both, i will use the extra saddle i have for the mount, is that a good idea then? I know many hate Newt due to collimation and spike in results maybe, and i think the weight, for me those shouldn't stop anyone, but is that the main things that prevent people from going with Newt?

I am trying to spend LESS to get more, rather than paying MORE to get less, APO triplet reft the good ones are likely $700 and above, for $700 i can buy either 2 small Newt for DSO or that 12" F4 for planetary.