Well Arx, Aperion Audio, EMP, TekTon, XTZ, Emotiva, and a few others that offers towers are sold manufacturer direct. Not sold in stores.
I can't comment on the PSB or M Lore, haven't heard either of those. I can say that I've compared the Arx to some Axiom models, Paradigm Monitor 7 and 9 towers and some older Boston Acoustics VR 1 and 3 towers, and the Arx was by far my favorite especially in midbass definition and neutral highs crisp and detailed but not "In your face, ear ringing".
Arx and most other internet direct companys offer at least 30days for inhome trial you can return no questions asked. Although Arx and most of the others you will have to pay shipping to ship back. Demoing speakers isn't free, just like you could go to the retail stores and demo by that might mean a few weekends to hit all the stores and waste alot of gas money especially if you have to drive 2plus hours to each store.
Just noticed on the Arx site that there is one pair of Arx A5 towers open box thats been discounted by down to $649, $100 off.
!Edited by gtpsuper24 - 10/1/12 at 5:59pm