Then there were 2

I'm not familiar with Rogue but if it were my money, I go with ARC. The Resale value is better and I know it has great sound quality.   ARC has a sound quality reputation that has spanned decades - they aren't going to ship second hand sound.

Rogue makes good stuff.  I had the M-180 monoblocks for a long time and they were great.  I own a couple of ARC pieces, but haven't heard the amp you're looking at.  If buying blind, I'd lean towards the ARC.  I would expect it to be just a bit more refined and as mentioned, it's going to have better resale value.

of the two, I would choose ARC

however, I much prefer the Quicksilver Mono 120's, and think this:

Pair of Quicksilver's, with KT150's is under $5,000. 

ARC is $10,000.

I would wait forever for the Quicksilvers, and use something else in the meantime. However long you wait, it is but a speck of time.

Two mono amps can be moved by one person, more placement flexibility, different cable lengths, ....

You could buy a used pair of mono blocks now, use them, sell them when the Quicksilver finally materializes.

elliot that was my preference as well, however they are hard to find used. QS has discontinued them. I agree with your points. The Ref75SE is not too heavy at 47 lbs.