Maybe we should take a step back and ask the OP what the room size is for this application, and how much music/movies we are talking about here...
I have a Plus/2 and love this hard hitting pounder... its thunderous.. and I feel it bodes quite well for music in my house, and I listen to a fair amount...
That being said, The Axoim EP 500 was on my list, as its supposed to be quite accurate, very well constructed, and pounds just fine... In my application (Huge Room 820 cu ft) Im not sure it would have put out enough bass for me.. I even added a second SVS Plus to the room. Nor did the EP500 pass my approval for finish quality with the square corners instead of rounded corners, and finishes available.... Im sure I would have been extremely impressed with the output.
Now I can appreciate Craigsubs reviews on subs, as he has dumped a ton of money to listen to many subs, that is just fine, but like speakers I think the happiness is in the ear of the beholder. 3pts difference even in his own words is basically the same.
If you have a small room, the Axiom will really perform... If you compare it to a single SVS sub like the Plus, I believe the Axiom will put the Plus to shame, but against the Plus/2 Im not sure the output will be as great for a larger room. Fit and Finish are extremely important to me. All 3 suggestions are with you on the Axiom/SVS PLUS2/HSU subs... Im not sure you can make a mistake here..
Just my opinion....
Warp