Hello I need a new complete 4ga. amp kit,and I come across the KnuKonceptz. The Amp kit will be used on a AudioQue AQ1200D.(1200x1) Whats the difference between these three complete 4ga. amp kits? Is it worth the extra cash,or is it a waste? $26.99+shipping http://knukonceptz.com/productDetail.cfm?prodID=KLM-K4 $39.99+shipping http://knukonceptz.com/productDetail.cfm?prodID=KOL-AK4 $51.99+shipping http://knukonceptz.com/productDetail.cfm?prodID=KFX-AK4 Thanks