Sged, I don't think you will find them in stores....I could be wrong.
V3 can be expanded with a paid add-on for the extra degrees (lean/tilt/elevate).
V3 will more than fit your requirements, I don't know what the price difference between 3 and 4 for is, but if I were buying one now I'd go for V4.
But I'm happy with my V3 and it's vector expansion
I use a track IR hat with the vector clip, it has 3 reflectors arranged in a triangular array.
White LED is a very good idea!
A powered USB hub is easiest, a pci add-in card is best.