I am a Harbeth lover so my opinions reflect on that. I own the P3ESR because I have a small room 11x14. First off you should go Harbeth :p
Now my real point. You should buy the Harbeth that fits your room size. If you need to have the speakers close to the wall go P3ESR but your room is a little larger and could probably handle the Compact 7. I say this because in my small room the P3R handles bass and scale very well! These things can sound very large and have surprising bass for a small size. But put them in a larger room (22 x 27 high ceilings) and the bottom rolls off much higher and it's ability to fill the room and scale diminish.
That is why going with a little bigger cabinet (compact 7) might be a more satisfactory choice for your room.
Harbeth does wonders all the way up the range - your only decision with Harbeth is the speaker for your sized roo
Now my real point. You should buy the Harbeth that fits your room size. If you need to have the speakers close to the wall go P3ESR but your room is a little larger and could probably handle the Compact 7. I say this because in my small room the P3R handles bass and scale very well! These things can sound very large and have surprising bass for a small size. But put them in a larger room (22 x 27 high ceilings) and the bottom rolls off much higher and it's ability to fill the room and scale diminish.
That is why going with a little bigger cabinet (compact 7) might be a more satisfactory choice for your room.
Harbeth does wonders all the way up the range - your only decision with Harbeth is the speaker for your sized roo