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Though we gladly give advices here, the tint can't really be adviced. I guess you know that 6500K is "cool" white and 4500K is "neutral" white? The cooler the tint, the less phosphor in the emitter and the brighter it is. That's why most lights that are sold are cool whites.
If you perform a search, you'll find numerous threads about warmer tints, some love it, some hate it, some are constantly in search for THE tint, I'm one of those. My personal choice is the 4500K as it has the best tint I currently can imagine for such a powerfull emitters. I own 2 Triples from Oveready, which use the same board, the cool white is brighter, but the neutral one gives a better rendering of colors and makes things look more 3D, at least to my eyes. Remember, that's my personal choice, another member will come and tell you the 6500K is the best one as it is so bright.
So, search for beamshots and make yourself an idea, in case of doubt take the 6500K, that's the tint you already know, so you'll not do a mistake. Some people sold their first neutral light the very first day the got it, as it's not their thing...