jaycar are ok.
that link you gave was to a 10inch sub - 225WRMS. i would advise you to go for a more powerful sub, and maybe a larger one (12inch) as you listen to a lot of dance. It just depends on how much $$$ and how loud you want your system to be.
(and just to contradict myself.. 10inch can be good for dance with the right box and amp.)
i can't really say anything for certain as each sub choice can be fine depending on how you set it up. but i would say go for a more powerful sub
hope that post wasn't too confusing!