Paradigm 3100/3200/3400DSP, Energy/Mirage or PSB. The HSU, SVS, and Outlaw subs are very good choices, unfortunately they can be a little pricy once they cross the border. I chose the P'digm DSP3400 myself, roughly $730 Cdn but you can most definately get it for around $700. This sub, as the name implies, has the DSP chip and 300 watts continuous power which should be good with your Axioms, or the DSP3200 would be over $100 less but with the same power (except with a 12" driver vs the 3400's 14") and won't reach quite as low. I believe the Energy and Mirage speakers are more-a-less the same thing, now that Klipsch took them over. They might be worth looking at too.
