Chris, listen to Sdcampbell, his reply to your question is excellent. Your existing system is so good that your budget of $12k spent on speakers or source components is not sufficient to take your system to a higher level. Sure, some of the speakers you mentioned will be an improvement over the SC-IVs, but the differences are not in keeping with the cost it will take to make the change. Large dollars spent for a small sound improvement. A DSP room EQ will substantially improve your system.
If you decide to go with the TACT or its equivalent, then I would also recommend you upgrade and add the Dunlavy subwoofers. Somewhat paradoxically, the added headroom in the bass pays big benefits throughout the frequency. spectrum.
If you decide to go with the TACT or its equivalent, then I would also recommend you upgrade and add the Dunlavy subwoofers. Somewhat paradoxically, the added headroom in the bass pays big benefits throughout the frequency. spectrum.