Sorry to hear about your dead EP500! Jakewash did lots of comparing between SVS and Axiom subs so he may chime in here with some relevant A/B comparisons. He has the PB-13 Ultra currently.

If you don't mind the look (I personally think they look cool), the SVS cylinder subs claim to sound the same as the boxes but are cheaper, cost less to ship, and have a smaller footprint. They are a little easier to move around too. Either model you are looking at should work very well with your system.