Sorry to take the lazy route but here it goes. A friend of mine is putting together a new system and I wanted to recommend 2mp Dahua starlights. I have a bunch of 5231s but can't find them. Is there an alternative for the price range of 150 190? Bought all my cams through Andy. Should probably ask him.
Look at the 3241T-ZAS which is the "update" to the 5231. I have a few and they are actually better than the 5231. Alternately look at the 5442 series. 4MP but better than the 5231 due to the 1/1.8" sensor. You may want to move soon on this because there will be price increases coming for the rest of the year due to chip shortages.
