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Well I am biased towards the ASI1600MM-C and the TS115 as that was my primary imaging setup. However, my Nikon D5300 (same sensor as the 5500), is a good OSC camera and was used on my MN190 without vignetting. Personally I would not mod the D5500, for these reasons:
1. It will cost you, or if you do it yourself you risk the camera.
2. Filter mod will likely ruin normal daylight use for other things.
3. It still would not be cooled, well not without sending it off to Central DS and spending what it would cost to buy a good CMOS cooled OSC astro camera.
I say these things having years of Canon mods under my belt, including cold finger cooled models.
Keep in mind that the Nikon cam be a pretty good winter camera, without cooling.
Just my 2 cents
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