JBL. Get some of their top of the line pro audio speakers for mids and high's, the GTi's are pretty mean SQL subs and you don't forget the crown made series of amps and a MS-8 to tune it.
Personally, I'd probably go American Bass - just because I see most of their equipment for bang-for-your-buck stuff, and my budget isn't exactly wide open. Prices aside, I'd love an all-Incriminator setup.
I'd do either Shocker and buy the new amp from Mike, or go with JBL and change my subs to MKII GTi's.... Would lean towards JBL since I'd need to get way too many more batteries to run the shocker amp.