I had 2 extra 10K bulbs around that were not used yet, and I plan on keeping the SPS on the 2 ends of the tank and LPS in the center of the tank. I have seen this combo of bulbs on other people's tanks and liked the way the tanks looked with that configuration. I will try it that way for a while and if I don't like it, I figure I will just get 20K's when these need replacing.
P.S. I tried the site too...they must be having problems or updating right now.