I have been thinking of getting two Sundown D4 X-18s and power them with a Crescendo BC 3500 @ 1ohm. Right now I already have done the big 3 with 2/0 awg OFC and have a singer alt 270 amps sitting in a box ready to be installed. I have a S800.4 atm powering 2 Crescendo tweeters and 2 Crescendo mids already hooked up but wanted to drop in some subwoofers now. Should I go with the Sundown Xs and the BC 3500 for daily use? Otherwise I was going to save my money and just get two Sundown SA-18s with a S1500.1 for daily use. I still am running my stock battery so any suggestions for what type of battery I should get Optima, XS power, Kintek, etc would greatly be appreciated.