Here have always liked my combo Outdoor Optex Camera / PIR's. They look a bit more like a PIR than an IP camera.
Made to last forever and very modular cameras.
Initially here DIY'd my first HD IP cameras using Analog Speco (new) dome housings and an IP HD camera board (which was a Grandstream board). These worked fine for me.
Now upgrading the Optex combo cameras with an HD IP 38 mm board with a wide angle lens, 5 MP board with POE and optional SD storage and wireless (not needed). I have posted the beginning of this in a blog to the right side of the forum. Started this a couple of years ago but never could find HD IP 38mm boards that would fit.