Ok guys, I found [http://blog.fosketts.net/2009/03/23/super-mac-mini/#comment-15054384|this] and [http://entertainment.webshots.com/album/574180083zoGosY?start=0|this]
This guy got a RAID setup of 4 HDs running through a port multiplier on a 1.83 GHz mini...
Now, the problem is to understand if also newest mac minis support PMs, and if mac mini's PSU can hook up also other four Hard Drives...