Thanks - that card looks like it would do the job. I notice that it even has a DVI output, though that one provides 24 bit output only up to 1280x1024. That got me looking at the rest of the XVR series. (I didn't realize you could get DVI for Suns).
The XVR-500 will do 1600x1200x24, but only with a 15 pin analog connector.
Then I found that the XVR-600 will also do 1600x1200x24 but has a DVI connector
I found a reference to it here
XVR-600 - Everything2.com.that claims that "[it] works, though with degraded performance, in the
Ultra 10." though they don't explain what they mean by "degraded performance".
Even the XVR-600 is pretty cheap these days, so what say you? An XVR-100 for 1600x1200x24 analog or the 600 with digital? Any reason not to go that route?