Chenbro make some nice rack cases that aren't as deep as a normal 660mm.
You haven't said how many RU you're after, but I've had my eye on this 1U case for a home server:
http://www.chenbro.com/corporatesite...l.php?serno=55
It's only 569mm deep, and has 4 hot swappable SATA drive bays in the front. Not sure if anyone stocks it locally though, and it sounds like even that's not going to be short enough for you.
The only problem with these tightly packed cases are that they typically use a whole swag of 40mm fans to keep the heat down, so they sound like a jet fighter....OK if your rack is hidden away in a closet or basement, but no good if it's in a study like mine is.
Good luck, and if you find something good, please report back.