EDIT: sorry didn´t read the complete post. my answer seems to be double post.
Hi there,
check out Perfect Power´s piggy back (smt6 or smt7). Lot´s of possibilities (if you know what you´re doing).
Far better than sfac (or whatever it´s called)
www.perfectpower.com
Also check Split Second stuff. Also very nice, but not as elaborate as smt7
http://www.splitsec.com/
cheers
jup