There looks to be three different types for the D25l2, xml u2, xte r5, and xpg s2. Not sure which one I would go with if I went that way. What do you all think??
U2, R5, and S2 are the cool whites. XT-E isn't currently available in Neutral; XP-G is R4; XM-L is T6
If you want more flood than throw, stick with the XM-L.
I don't have the D25, but I have a neutral (XP-E) P20C2MKII, and it has a very nice (though quite throwy) beam. In my experience, EagleTac makes some of the very best off-the-shelf lights available.
I do have a couple neutral XM-L's, and I like them a lot. I'd probably love 'em if I wasn't recently spoiled by the 4500k Hi CRI Nichi 219.
If you really want a great neutral white light, pick up a P60 host and have Malkoff, Nailbender, or VinhNguyen54 supply you with one of their 219 drop-ins. If you really prefer a bit more flood, a neutral XM-L is a wonderful thing.
Good luck!