i'll look into that chip, this was a chip I was looking at though which kinda does what your saying as well. 60 watt CREE RGB WW W chip only 1 channel though
[Ebay Link Removed] Cree XP-E Multichip LED 60 Watt Red Green Blue Warm White Light 24-26V 1-2A | eBay[/url]
unclear if the Warm White is the high CRI version Cree makes or not. but I imagine with the RGB it will be fairly well covered spectrum wise.