So out of curiosity, why didn't you just go with a well established sub (not to be a ****) like an SA-8 or DD 1508? While (from what some testers have told me) the SA-8 may not handle more than 600-700wrms out of the box without a recone, both of those subs are known to perform at tremendous levels, and don't really cost more than $200 each (assuming you get a recone on the SA-8 with upgraded parts for about $60-70).
Also would like to say, interesting thread, I like to see people screwin' around with 8s. Also, thread would be much better with pix //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif