The only part of that I'm qualified to comment on is screen size, since my Dell gaming laptop (G3 17") is too old for me to recommend. I think some of the answer depends how often you anticipate using the laptop. If it's a decent amount, you're going to want a 17". Unless you plan to carry it around for hours, I don't think the extra weight of a 17" vs a 15" will make much difference. If you're going to use it infrequently, you may want to save money by getting the 15," but if you can, borrow one for a few hours first to make sure the size is okay.
I've never scrapped on anything but a laptop, so for years I had a 17" screen (and for a few years a 15" screen) and thought it was fine. Then last summer I bought a 27" monitor to use with my laptop. I've got to say, now when I have to be away from my desk I feel limited by the 17" screen. I still do it a few times a week, but I feel the difference. I need the portability too much to ever switch to a desktop, so I'll just have to keep making do with the 17". With your eyesight being a concern and being used to working on a larger monitor, the larger the laptop screen the better.
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