Thanks all for sharing your thoughts. The suggestions to move up the JA line have always been on my mind and is something that I aspire to. Used JAs are fairly rare and I'm patient.
I should note that I'm not looking to replace the I5 but to try new amps in order to explore how the JAs sound with other amps. The I5/RM7 sig combo has been with me 20+ yrs, it's not going anywhere and is my point of reference (sure there are much better systems but also much worse).
Suggestions have been made to add a subs but I think they might overpower my space and I don't really have good placement options for them anyway. More powerful amps have been suggested, but for my listening levels I don't feel that I really need more raw power. If that were the case, I'd probably move up the Sim Audio line because I do like that house sound.
The rational is that I rarely exceed 32 on the volume setting which is .1 dB steps from 0-37 and .5 dB steps from 38-51. And most of the time volume is set from 24 to 30. Given that the I5 is rated for 70W with Class A operation for the first 5W, I'm guessing that for those levels, the I5 is delivering somewhere in the neighborhood of 25 to 40 watts. Of Class A/B power. So what would 30W of pure Class A sound like? I'm dying to find out...
Lastly JA owners, are you out there?