[L|_|da]

I got a guy who can get me L7's for around 120+S&H, so probnably about 140-150 a piece. i want to get a XXX18, but its pretty expensive and the amp gonna be insanly expensive as well. im thinking about getting 2 L7's and an amp for now. then myabe 2 more later.
does anyone have anyone oppionions about this sub? ive heard pretty good reviews, although it is a mainstream product.