I recently purchased a pair of Polk Audio Monitor40's (fronts), Monitor30's (rears), and a CS1 center. I'm going to pair them with one of these receivers: Pioneer VSX-520, 820, or Onkyo TX-SR508. I'm torn on what sub to get for this set up. My room is about 12x17 with vaulted ceilings and it will be used nearly exclusively for movies, a little bit for gaming, and some music once every few weeks. I have narrowed it down to the BIC F12, V1020, or V1220. What sub would you choose for this set up. Must be under $200 shipped.