Advice please.

Room is rather small (approx. 20 X 20 feet); musical preference is classic rock. I generally do not listen to music at very loud levels. Not sure exactly what the concept of SPL is. Sorry.

My suggestion to you is go listen to whatever these guys try to convince you is best before you buy. If you cant listen to set first then move on down the line.
  I have had great luck with used Klipsch speakers and while they might require recapping the crossovers the basic component list will last for decades unless abused. You can buy a whole lot more sound quality on the used market for the dollars spent than buying new will ever get you.

Listening to anything outside your own room is at best, tainted

If you hurry, Emerald Physics has a few pairs of their outstandingly reviewed open baffle speakers, all of which have a small footprint. I have owned the KCIIs with upgrades for 3+ years ~ $3K; everything I changed in my system is immediately heard.

Once upon a time I owned Magnepan 3.5Rs. I much prefer the KCIIs. All EPs are super efficient and easy to drive.

EP is offering the KCII Pros with carbon fiber drivers and polyester tweeters for $1295 OMGosh!, but have several higher up models all reduced to under $4K

hth

You can do better potentially.  The question is what do you want in terms of sound?  
Are you looking for enhanced detail or a better, more immersive soundstage or a bit of both.  The two speakers you mention are wonderful in terms of detail.  Not so sure about Soundstage.

I would look seriously at the Revel Performa3 F208s.  They will pair well with your amp and will give a better soundstage. 
You should also look at Scansonic.  The MB3.5 B and the MB5 B are obscenely good speakers and will work well in a room your size.  There are several reviews of the MB5s and they have since been redesigned.  
I am a Scansonic dealer.  I have no relationship with Revel.  

You can do a lot better, even at new prices.  And if you considered gently used, you could get something great.  Just looking at Audiogon today: Dynaudio Contour 30, Spendor D7, Reference 3A SEMA, PMC Twenty5 24, Fyne F702.  You could wait for a Vandersteen Treo CT.  Check the "other" listing site too.  The world's your oyster.