Integrated Amp Upgrade-itis hitting....

I've owned the Rogue Sphinx V2 and the Pharoah.

Both have nice resolution, and overall dynamics, however, neither produces solid, deep bass at low volumes. If you always listen at somewhat loud volumes, the Sphinx is a good amp. Overall it has a "front row" sound.

I'd bet a considerable sum that if you listen to the Marantz and Rogue back to back at moderate volumes, the Marantz will play deeper. 

I would take your current amp over the 2 amps that you are looking at. If you want an upgrade you will need to move to something like a halo integrated. What you have is pretty nice. 

Dialogue premium Prima Luna HP integrated -  I use it with a Marantz - sounds great and has both a headphone and phono stage installed.  Best part is tube indicator light which never goes on - but its there so you don't have to wonder about tube quality. Looks great too.  I'd agree with the person who suggested Cronus magnum as well as an alternative.  

Thanks guys for the recent comments, all will be considered strongly. Found a place a little over an hour's drive away who has Rogue gear. That's a start I guess...The MuFi is a nice amp just getting a bit long in tooth...

To me, it doesn’t sound like you know what you are trying to achieve with the amp upgrade, because your only fault with it is "long in the tooth". I would seriously consider bringing it with you to your demo and having the dealer a/b it with whatever you are considering. The 3.2 and the other MF stuff of that era was a good, non-offensive amplifier and you may end up preferring it to what you are considering. I would also consider listening to a better CD player.  That might achieve more in the way of better sound than an amplifier swap.  I think you are wise to enlist the services of a dealer instead of stabbing around in the dark.  They should be happy to do the comparisons for you.  Well, maybe not happy, but they should do it.