Well done. I am delighted for you. The K-7 is a great camera and I strongly agree that it one of the best value for money dSLRs on the market right now.
I think that the discussion on high-ISO was often too narrow with not enough focus on the real applicationsL i.e, low ligh conditions.
Yesterday I shot over 300 photographs of volleyball in a very poorly lighted indoor hall with my K-7. Using the right lenses, I got close to 1/3rd of good shots, and most discarded shots were blurry, because I chose wrong settings (mea culpa): human errors, not camera issue.