Just wanted to share my experience for others looking for replacement bulbs. I replaced my 6700k coralife cf bulbs with 10 000k bulbs and they really look great. I find the colour to be a lot clearer, I found the 6700k ones to be sort of yellowy. I also bought one coralife 10 000k but I ordered online and accidentally only got one instead of 2. So went to BA's and got an all-glass 10 000k bulb for $39.99 ( as opposed to $59 fo the coralife) and as far as I can tell they look identical when the fixture is turned on, I can see no difference.
They are so much cheaper, I'll probably buy all-glass bulbs from now on. :)
Irene