I've found a guy selling a used Rl-I10 for $150. My first question is, is that a good deal? The sub is in good shape. Also, how would this sub compare to say a 10w6 or an IDQ 10? Not as good, same, or better? Planning on running sealed on 500 rms at 2 ohm (dual 4 ohm). Depending on what you guys have to say I might buy it tomorrow. For cheaper brand new I know I could pick up a SSA Dcon. What do you think I should get? I'm going for SQ.