I used to own a fair few holo- domains. However, I might have been a bit early to the game, as I didn't get any interest, so I dropped a lot of them, including holoviewers.com, which might have been a mistake.
With holofax.com, you are taking a bit of a gamble, because you are trying to guess what term will become popular. However, I see your thinking behind the name, although fax is already something of an outdated technology.
As for pricing, I think it's best that you decide what you want for it, or invite offers.