If you desire to out-do/one up on your friends' speakers by Size and SPL, you oshould consider JBL Pro series and others that are comparable. There are many options for you. You can get a dual 18" subs for around $800 each or get two 18" subs for around $500 each for each channel. Or maybe have'em all in a same cabinet with a set of massive stands. Somem like these http://www.musiciansbuy.com/JBL_SRX7...ee_SRX738.html

http://www.samedaymusic.com/product--MACSA1532Z

Powered/Active monitors might be the way for you.

I understand that you wanna blow away the entire neighborhood. That sounds like soooooo much fun since I do not live anywhere near you. What is the size of room your speakers will be pumping in?