Theloudest.co.uk
There stuff is expensive, but thier eBay shop does a lot of discounts, especially on package buys.
All their stuff is competition spec, very impressive stuff... loud and high quality.
http://stores.ebay.co.uk/theloudest...d=801674629&_trksid=p4634.c0.m14.l1513&_pgn=1
I got the 2000W 6x9 package a few years back... Still going strong, could probably do with having the speakers refurbed or replaced, but I've had them on around 80% volume pretty much everyday, every journey for a few years. They turn heads. Infact, I should probably have a hearing test.
I just wish I could have afforded the sub package to, instead of building my own passive sub setup. Overall I'm still very happy with my setup and havn't changed it.