I voted 4500K because it’s my favorite after a de-dome. But, I think carrying 5700K, 4500K, 3500K, and 2700K would be smart so there are options at various color temperatures without having to carry every single CCT.
I just put a 5700K in an S2. It is mighty good both with the dome and without. The high CRI and R9 make it fairly unique (with the exception being Nichia High Noon?). The 2700K dedomed to hit 2000k-ish in the 3535 footprint is unique too. So those two would stand out in the lot.
I think Simon said he was going to limit how many CCT’s he carries at a time due to the cost of stocking up. Otherwise, it would be great to have a place to buy all the options easily.