i guess u r quite new in the ICE scene.

everyone was a newbie at a point of their life here. so, wat u need to do is expose urself more, read more and frequent more forums, local and overseas.
ok, back to ur question, ur sub to be, for sure it dun look like the bising type. but the it's the ported enclosure dat makes me worry, cos ported box are tuned to give a boost at a certain frequency, thus when u listen to songs, u may experience boomy bass with this, not loud but boomy. some may like it, some may not, for SQ, wat we wan is linear frequency response. for some characteristics of SQ bass, u can search for Peerless XXLS, SEAS SW300, Rainbow Profi or Vanadium and so on. u can compare them to roughly understand the specs of SQ subs.
SQ sub, wat matters? transparency, speed and the ability to play 20-200Hz well. RMS value doesn't matter much if u r into SQ, u just need to match a SQ sub with an amp with gud control and u r gud to go. but to achieve wat i'm talking here might cost u quite a big sum.