Suggestions for replacement speakers

I have a set of B&W DCM 604 floorstanding speakers I've had for years and it's time for an upgrade.  

My room is rectangular (kitchen, dining area and living room - open floor plan) about 15' by 42'.  The speakers will need to be set up in the living room area.  The rear of the speakers is a solid wall and they fire towards the couch, about 13' away, which sits against a large picture window.  The ceiling is 10' tall. The floor is wood plank. 

I can't have the speakers realistically more than 2' from the back wall and I'd prefer speakers that don't require a single seat for optimal soundstage. I generally listen to rock and blues. 

I have ample power to drive most anything at 270wpc and due to budget constraints, am looking for nicely cared for used speakers. This is for a 2 channel system. 

I'm going to listen to Martin Logan Aeries 1 speakers and well as a pair of Vandersteen 3 Signatures next week.  The Walsh Ohm speakers have been suggested to me as well.

My budget is 2k.

What should I be considering?