PhotoMan,
I have the IPF5000, I love it, BUT
DON'T BUY IT!
In a nutshell, us IPF5000 owners ended up Canon's Beta testers again on a new class of Printers for them, and the updated model is announced less than a year after the first IPF5000's were available..
There are not and most likely now with it's being replaced already, never will be any 64bit drivers for it.
As mentioned by JBillings, the new IPF5100 has already been announced and should be on shelves mid/late summer.
Several interface improvements have bee made but the most significant upgrades are;
1. The roll feeder is included! (total cost will be lower)
2. Canon have already improved the black inks, and God Damn them they won't even FIT in the IPF5000!!
This means the blacks that we need for the IPF 5000 will become very hard to come by very shortly as all future units will use the new inks.
Cost per print is actual very affordable even though the cartridge price seems high. You get a lot of printing out of those cartridges.