I currently have 2 av123 x-ls for fronts a x-cs for center and 2 HTD Level 3 speakers for surrounds. I am currently on pre-order for the MFW-15 SUB from av123. It is not due out until April. Not sure if i can go that long with no SUB. I mainly use my system for movies but want a SUB that can go real low but still sound good and crisp. Willing tospend no more then $700.00 any suggestions. This is all powered by a Yamaha RX-V1700.