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The diffrence between the F4 - F5 are only a few hundred grams we are talking 20cm less sheet metal in the F4.
Yes you will need coma corrector eventually for AP, bare in mind observing with a Newt can be a a real back pain on a EQ mount. I would suggest a straight through telescope like refractor or even a MAK. however viewing DSO's would be an issue given the cost needed for larger apperture in these types of scopes.
My suggestion would be a second hand HEQ5 + Sky-Watcher Black Diamond ED80. Good base for some wide field photography and a great guide scope if you decide to up the stakes later on for AP..
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