It does seem that the rest of the market has moved past Axiom, particularly when it comes to low frequency.
I have the same dilemma. Not having done comparisons, I have to rely on others opinions.
When I listened at Axiom, I liked the sound of the EP350 for music. It did blend perfectly with the M80s. Again, I have to draw on others experience on the blending. I have no idea how easy or hard it is to blend a sub in.
I personally am looking at either Axiom or SVS (PB12/PB10) because those are the only cost effective options in Canada. By the way things are going, I may have to buy both a 350 and a PB10 to see how they compare.
Having listened to the 175, I have to say that it is not a contender for HT. It barely had any kick at almost full volume in a 10x20x8 space.
On the MFW15, its hard to separate the hype from fact. I would like to see some independant measurements.
I'm sure the folks at Axiom are following these sub threads with great interest.