Dual Monitor Cube Setup

[Fielder]

I am looking to move to a Dual monitor setup utilizing two Apple 20" 
Cinema Displays.  I've upgraded my Cube to a ATI 7500 videocard with a 
lower case fan installed (working great).  The dual monitor capable 
7500 has an adc connector and a standard vga connector.  I've read the 
Cubeowner FAQ but i'm still slightly confused as to what are all of the 
options I have to connect the two lcds.  The only option I have clearly 
seen is the expensive Gefen Vga to Adc conversion box ($250-$300).  In 
other words I would connect one Cinema to the adc port on my 7500 card 
and the other Cinema display to the vga port via a vga to adc adapter 
(ie. Gefen conv box).  Is there another less expensive, more 
streamlined option out there for this kind of setup?  I have seen the 
Apple DVI to Adc adapter but I don't think that's gonna fit the bill.   
Inquiring minds would like to know.

Junkmein