I would recommend the DuxCell with 4G option. While a little over your budget it ticks all other options and is very reliable, plus you get the full RouterOS.
It's essentially a RB912 RouterBoard with Sierra MC7304 LTE card. You can add another UFL pigtail to it to connect in a 4G antenna that has MIMO if you have an external one which support that. https://shop.duxtel.com.au/product_info.php?cPath=23&products_id=106&osCsid=ndoa5trn57930jrh9e0dc1h9b7 Matt
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