Nice! I don't think you will be disappointed with the Cree's. Mixing is fine, I couldn't find the 5k's around me in stock, so I will use my 4000k/4500k cfl's to mix it up. Though I am tempted to just jam 10 bulbs into my space and call it a day.
These things put out no damn heat at all it's ridiculous.
Last: my opinion is LST, with practice you can get the same results as scrog easily. I started with pointers from bonsai books....but of course it isn't hard to bend and tie down a plant without experience either. But every bit helps