Need help looking for the best deal. I have the choice between buying secondhand or new subwoofers. The Subwoofer I am looking for is for movies maninly and I look for real sub bass to play next to my floorstanders from KEF(Q50) My choices: secondhand; 1)KEF PSW 3000 for 300GBP. Unfamiliar with this sub, but pretty expensive model. 2)REL Q50 for 200GBP. I rather have the Q100. Not sure if it's powerfull enough and pretty big. new; 3)MJacoustics for 400GBP too Expensive..certainly compared to price in UK.But if i buy in UK..299GBP. Nice size. 4)REL Quake for 340GBP or 370GBP if Cherry model. 5)Velodyne CHT10 for 400GBP. A fave of mine if I have the money.And not sure if the size is acceptable in my household. 6)Yamaha YSTW 800 for 340GBP. These are my choices. 400GBP is my absolute limit. I have been stretching my budget to get the best possible subwoofer in my budget. The secondhand subs intrigues..should I go for one of them? or should I buy a new model mentioned above? Any help greatly appreciated.