The IR cameras are not much more expensive than the non IRs, they are just in black and white.
We helped our client installed some starlight cameras from EasternCCTV, they get good color images at low light. I don't know how much you plan to spend but if I were you, i wanna get some new cameras with new technologies that will last for a good number of years.
And the ones we were using were IPC, but I know they also have TVI starlight cameras.