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I'm not sure about barlowing Morton as I haven't used one so far. I have the 25, 18, 12.5, 9 and 6mm which is about all I need for our atmosphere here in Perth.
On average the 6mm only comes out on good nights and if you are unlucky an eyelash can ruin the view however I've only had it happen once or twice in a few years of owning them.
Seeing through the 6 to me is no harder than the others even though the glass is way smaller. Everyone is different though as you know so I think you will have to gauge that for yourself. If the 7 is manageable/comfortable for you then there is not a huge amount of difference to the 5 in reality.
If you have tracking then I would imagine using the ortho would be far easier as well.
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