Hello- I'm in the process of builing my HT. (I'm very new to this experience) I already have front, center and rear channels. All I have left to get are the subs and reciever. I pretty much have my mind set on the Yamaha RX-V1400. I'm willing to spend $550 shipped for a new unit. I'll be willing to purchase a used one of course. As for the sub, I have no idea what I'm looking for. I like tight bass, and I have Polk RTi6 bookshelfs for my front channel and a Polk CSi3 center, so I know that if my sub is too big, it won't match my front and center channels. My budget for the powered sub with enclosure is $200 shipped. Thanks!