"I own AES six pacs...are there any tubes that would get me closer to the SET sound? which assume is more palpable, lush, organic etc."
Don't worry about the SET sound, properly driven planars have their own "magic" that is just as engrossing and enveloping.
I heard the ESP Concert Grand ($40k) driven by Kinetics 300wpc Wavestream Kinetics V-8 amps($35k) at the LA HE Show this year and it was absolutely glorious. I would sell off my SET/horn system in a heartbeat for fraction of that glory. Granted, it was $100k system.
But, the biggest problem, Tz7, for anyone trying to lend suggestions is that you have never defined what's your price range.
The Cary Six Packs are ~$2.4k new and ~$1,5k used. Is it accurate for us to assume that you'd like to spend a similar amount? Less? 2x as much? 3x?
The Six Packs are rated at 55wpc, but also 110wpc PEP. Do these drive your Maggies well?
Also, what are you using as a preamp?