I have the Onkyo 604 with the Fluance AV-SC Center and a pair of the Fluance AV-F3 Towers. (I will add the Fluance AV-BP2 Sattilites once I get the extra $100 ). I want to add an inexpensive but decent quality sub. I have been suggested the Velo VX-10 , Velo VRP1000 , AV123 X-Sub , HSU STF-1 , BIC V80 , or Either Fluance Sub So just give me your vote and reason... Thanks! P.S. I estimate the room is 15x 10 but isn't closed off... Here's the plan... I don't want to shake the walls but I would like as good quality as I can get.