The Nikon D5300 is way under your price and has a good sensor, 24 megapixels, APS-C size, and pretty good Ha pickup. No anti alysing filter as well. You can get away without a mod. It runs theathered via Backyard Nikon.
Watch all the bells and whistles some DSLRs come with these days, many of which eat up battery power and are useless for AP: things like touch screens, excess in-camera processing which generates heat, etc.
I would avoid full frame for the reasons mentioned below.
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