Integrated Amp Upgrade-itis hitting....

No one has suggested the Moon neo 250i integrated or higher.... is there something wrong with Simaudio?  I am asking because beernut has transmitted his upgrade-itis...
I have had the Marantz 8400 for more than 5 years now.  It runs almost 24/7, it is dead silent, it has enough power, it is built like a tank, runs cool even when driven moderately loud,  and it sounds relax, laid-back, with some decent detail.  The volume control offers great contol unlike a nad, it adds decibels slowly with precision.  Before the marantz, I have had a nad 316, arcam alpha 8 (bi-amp combo), adcom 5300...
I paired the marantz with psb image t5 for some time; not a good combo at all.. it lacked dynamics and sound was too dark as if you had blankets on them.  I also have had the rega rs5 plugged-in; excellent combination, really really good... lively, clear, transparent midrange... I kept this for 5 years. Next, I have had totem hawks - good combination, but I think it does not bring the best midrange that the hawks are capable of, unless they are not capable of superb midrange.  I also have a pair of wharfedale Denton 80th.  Again, 2 laid-back components, not the best match...sounds a little too dark.
hence, me too... the upgrade-itis..  Moon Neo 250i anyone?

Thanks for the sage advice everyone. Seems I would need to drop some $$ to have a qualitative improvement over the MuFi at this point....Hmmm.

Chrisr - SA is good stuff! I upgraded from separates to the SA 600i....best move ever! The SA soundstage, detail without harshness, is awesome. A true dual mono architecture with high current capability, doubles into a 4 ohm load. Find a dealer and listen! Enjoy the music!

Gabby, thanks for feedback!  How is the volume control?  Solidly built, smooth progression?

I have gone through several amps and preamps and I now have the Line Magnetics 508IA integrated. It is the best sounding amp that I have ever had in my system.If you are looking for a great integrated,you could give this one a look.