If you're happy with the presentation on jazz with the components you have, I might suggest that you move to a higher end integrated, or a tube preamp/SS (or hybrid) amp, & a pair of speakers that will do rock well: Von Schweikert, Tyler, Silverline, Reimer, etc. If you sold your current amp & speakers, and applied them to your budget, I think you will get more for your money. I don't want to talk you out of two systems, but if you are happy with the Krell on jazz music, a really good tube pre/SS amp set up will cover the full range.
Just my two cents...
Just my two cents...