page 11 of the SSI EEB 3.61 shows the board dimensions and hole locations:
http://ssiforum.oaktree.com/pdfs/SSI%20EEB%20v3-61.pdfso it's the same 12" x 13" and hole layout as EATX
I have a full tower
Chieftech Mesh Bigtower that supports EATX, 8 internal harddrives, 2 floppy bays (could use for harddrives), and 6x 5.25 bays which could convert using the 3 bay / 5 harddrive enclosure to give 20 harddrives if you didn't need optical/floppy lol... I guess I could use one of the 5-way enclosures, and a couple 1 bay / 1 harddrive enclosures, include a floppy drive, so 8 + 1 + 2 + 5 = 17 harddrives... I'm running 9 internal harddrives at the moment, and may add 2 more for 11 internal + 1 external

I also have 4U and 5U rackmount cases, Queenserver RM421 (wouldn't readily support 8 harddrives with optical+floppy) and
Yeong Yang W203 with the optional 5-way 3-bay
YY-W20x-cage... I could get a second cage and still have space for an optical and floppy drive, so 10 harddrives... this Yeong Yang case comes with feet to be set up as a pedastal (tower) or you can get rackmount rails to put it in a server rack
You probably can't get either of these cases in the US, but a proper FULL tower or 5U rackmount case is what I'd recommend going for...
Out of the cases you listed the Lian-Li 2100 would be nice if the budget allows it, if not, then the Stacker 810 would be my next choice
I wouldn't go for any of the mid-towers you have listed because of concerns with space and cooling