Yes, neutral white would be an option. Warm white to me is much too red, but it does bring out certain colors differently.

There is nothing wrong with XR-E neutrals. Sure, XP-G neutral have higher output, but XR-Es are still a viable option, and cheaper than the XP-Gs. Also easier to find. We (Nanotuners/Nanocustoms, a sponsor here), have neutral white XR-Es in stock, but should have XP-G neutrals soon (don't know the exact date). If you aren't going to use dimmable drivers, you will need to bias the ratio more towards blue. Stick with 1:1 if you use dimmable.