I have a Dahua 5231 and love it but I now want to know what is better (or the next level up in low light performance) in the mini-bullet/dome or turret size - I assume it's Axis, Bosch, Samsung but wanted to know what models you'd recommend for general home security - would there by anything new or used for under $500 that would be significantly better than the 5231? If there is an old thread I searched and didn't find it - but please let me know if I missed it.