I am going to get a pair of CDT Audio EF-61FG and I was wondering how big of an amp do I need to push it, like 800W, 500w, or 1000W? I was looking at getting a 4-channel amp; I had this one in mind http://www.ikesound.com/product-product_id/2213I have had one before and I liked it, I was happy with the power, would this be a good amp?