Digital BW, The Print

I'm hoping you all can help out here with figuring out what options are 
available for grayscale inksets in 44inch Epson models.  I know that the 
various options have been discussed in bits and pieces over time, but I'm 
trying to get the big picture.  Here's what I think I know -- please add, correct, 
disagree, etc.

(1) Epson 9600 w. PiezoTone inks, NOT, as I understand it, with the Piezo B&
W ICC system -- if I read their website correctly, this is not currently an option 
with the 9600 unless you get StudioPrint RIP, which only runs on Windows (I 
have a Mac).  If anyone cares to elaborate on the differences between the 
PiezoTone system and the Piezo B&W ICC system, I'd appreciate it (Inkjetmall 
does have an FAQ on the differences, but it's written under the assumption 
that you already know how the PiezoTones system works, which I don't)

(2) Epson 9000 w. Piezo B&W ICC system (I have no idea what the 
differences would be of the 9000 v. the 9600 for grayscale inks, nor do I know 
if you can even still buy a 9000 anywhere)

(3) Epson 9600 w. the Septone system, EXCEPT this is only an option if you 
run Windows.  The Photoshop plug-in does work for Mac, but only works for 
the 2200.  (Same is true for Septone with the 9000)

(4) Epson 9600 w. MIS's UltraTone 7 system (not yet available)

So, if I'm understanding the options correctly, there is currently no grayscale 
inkset for the 9600 that will work with Mac (short of running Virtual PC).  
Meaning, for wide-format grayscale inks, either (a) find a 9000 (if you have a 
Mac) or (b) buy a Windows computer.

Any options I'm missing?