which Axiom/SVS/HSU models did you compare? did you compare them in the same room?
I basically had the same budget when picking a sub (~1200-1300) so I compared all the subs in that range from Hsu, Axiom, AV123, SVS, and others. I have a PC-Ultra and Plus/2, and read extensive comparos online from reviewers i would consider credible.
Comparing the Ultra to the Plus/2, i found the Plus/2 louder, but sloppier. The reviews i read put the Axiom on par with the Ultra, and the HO higher than both. HO>Ultra-EP500>Plus/2. Beware of reviewers that only post SPL graphs
I ended up with an Ultra, but if i had the same decision to make today, i'd have an HO w/Turbo. At that price, it's very tough to beat.