I ordered mine from a Mitsu site in the states, however (ready to be flamed for this one) Highland Starter and Alternator gave me a VERY competitive quote for a custom made small housing alternator!! The only reason I decided against, was the one in the states comes with brackets and a pulley for my car!!, The Tsunami amp is killer, one of my buddies ran it for quite some time, However only 2ohm stable IIRC!!!! I think you should get a killer single 12" Fibreglass enclosure and still throw some Air on it :P thats just me though
The only other mod OTHER then that, Im planning on running 5more runs of 0ga!! HEAVY!!