> I have to decide if to buy a ultra 10 or a ultra 60.

Someone told me the rule of thumb for PCI based ultra sparcs is:
if x > y then prefere a Ux to an Uy

> ARe both well supported by netbsd?

Not sure, I let other answer this.

> Then I wanted to ask if there is any way to get rid of the 8GB limitation
> in IDE disk. I Remember I had this problem on a Ultra 10 running solaris.
> Does this applies also to NetBSD?

No:

Filesystem  1K-blocks     Used    Avail Capacity  Mounted on
...
/dev/wd1a    75754803 37010231 34956831    51%    /mp3

Beware that the U10 (IIRC) does not do UDMA with it's build in pciide
controller, I don't know about the U60.

Martin