If you want a meter that reads degrees kelvin, you'll have to spend a relatively serious amount. Seconic have one, its not cheap. Look up their site.
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If I had such a budget I'd go all prime other than the kit lens:
5DIII plus kit $ 3700
24 L II $ 1500
50 L $ 1400
135 L $ 1000
Alternatively, 35L + 85L along with the 135L