I guess it depends on the sound you like. You're going to find fans of every brand you mentioned including Axiom. The only links I can think of that put them head to head with other online brands (Ascend, Aperion, Av123) are these:
http://www.avsforum.com/avs-vb/showt...hreadid=263414
http://www.ascendforum.com/forum/topic.asp?TOPIC_ID=4
In both of those threads the Axioms look to be near the bottom, though without hearing them personally all you're doing is taking other peoples word for it. They have a 30 day refund period and even pay the shipping if I recall correctly - try them out and see if they sound good to you?
Personally I'm more a fan of B&W and Onix Rockets in that same price point. I think for the same cost as one of the better Axiom systems I would personally go with some B&W 600's or a Rocket 550/750 setup, but that's just me.