Get MacPro or an external Firewire enclosure for use with any mac.
Buy Blu-Ray burner, and RoxioToast.
Install.
Done.
So you are saying you want a computer with user replaceable parts but can't figure out / don't realize how to install a Blu-Ray burner?
If you say you have money to spend on a professional system, but is only *professional* enough to use a 12" iMac G4, then you actually don't have the money. You should get an intel iMac instead, or perhaps invest in some training in your desired field.
You can ONLY author and burn blu-ray VIDEO discs on the PC side. That's unforgiveable as well.
There's a new iMac in the house; I let my roomate use it. I use it when necessary. I also have an external blu-ray burner, and the Roxio blu-ray authoring program.
But NONE of that negates my claim the Mac Pros ARE NOT CUTTING EDGE. Except in price.
Or that the most expensive desktop in the world SHOULD BE ABLE TO DO THOSE THINGS OUT OF THE BOX without RESORTING TO WINDOZE.
Which I ALSO have, with Parallels.
I also know how to put in cards. I SHOULDN'T HAVE TO for what Apple charges.