Thanks for all your comments.
I went with the supercube.
I got one from Bajawaverunner, they have a 240V version. I got a good deal, super cheap price.
My family did not want a big sub in the living room, BIC F12 was out. So I had to compromise.
I did not like low end small subs - Energy 10, Martin Logan Dynamo 8 inch, Polk PSW10, Klipsch SW 350.
I hope this supercube performs better than the smaller cheap low end subs.
I realize I can never get a good coverage from this. But atleast it is a big upgrade from cheap HTIB.
I will go for a better sub when I get my HT room.