help choosing cree cxa/cxb + xpe,osram gold,luxeon rebel

hello.
im in the planning and designing part of my own diy led and would love some help to select parts from someone with real knowledge and experience.
I want to use Cree cxa or cxb series cobs with about 65% warm whites @ 3000-3500k and 20% 5000k and 15% 6000-6500k.i have not deceided on what models to choose as i dont know what is highest bin from cree availeable neither do i know the diffrence and meaning of bin ? i was planning on 3070s but i think ill rather have more smaller ones soft driven @ 40% maybe. does anyone know what is max w on the various cxa cxb 2530,3050,3070 and so on? and i also wonder if anyone knows what mono leds is best in the various nm specs nowadays. i heard cree is best on whites,and heard the gold line osram offers is very good red and blue same i have heard about luxeon rebel for red and blue. any cents on this anyone?
also i would like to add that im only interessted in suggestions from cree osram and philips lumileds luxeon rebel
 
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