Hi Ted-
Are you restricted to only the JM Lab or the SF? Of course these are both respected speakers, but there are others out there that I feel are better "all around" dynamic speakers such as Von Schweikert, Dynaudio, and Wilson. (your opinion may differ, of course). System Synergy is extremely important with the Dyns and the Wilsons, less so with the VS. Have you ever heard a pair of well setup Wilson Sophias? Wilson has a reputation of being detailed but not "musical", but this is not the case at all with Wilson's current generation of speakers.
Are you restricted to only the JM Lab or the SF? Of course these are both respected speakers, but there are others out there that I feel are better "all around" dynamic speakers such as Von Schweikert, Dynaudio, and Wilson. (your opinion may differ, of course). System Synergy is extremely important with the Dyns and the Wilsons, less so with the VS. Have you ever heard a pair of well setup Wilson Sophias? Wilson has a reputation of being detailed but not "musical", but this is not the case at all with Wilson's current generation of speakers.