G5 Question

All of the stock video cards will drive the 23". Unless you are deadset on 3-D gaming, any upgrade videocard is not worth the money in my opinion. The extra money will do little or nothing for 2-D programs that most of us use most of the time.

Before you upgrade the video, get yourself a nice 250 Gb Firewire external to use as a backup drive - and then set up a backup regimen. I guarantee that your internal drive will fail someday, and the pain of losing your data will be much greater than the pain of X number of fps slower in your favorite shooter.

 

For your needs, the 6800 DDL is pointless. The stock graphics card will easily handle 23" cinema displays. I'd have to check, but I think the 9650 can run a 30" Cinema Display, too. THe DDL's advantage is that it can run two 30" displays--and you won't even be using one.

You can only buy what the Apple site has, though you might find something in their refurbished pages with different video hardware. You can add Bluetooth later (via a USB add-on if nothing else, but I'd think the internal module can be installed by end users--someone else will have to help with that).

 

Adding a DVD burner yourself isn't that difficult. If you need to update the firmware for it though, you're going to need a PC (from what I understand) to flash it.

No, RAM doesn't have to be added in pairs. It's not RAMBUS memory. If you want to run in dual channel mode, however, you'll only want to have two sticks. And from what I know, to run in dual channel mode the memory doesn't have to be the same brand or size (though it does help) as long as it's the same speed/has the same specs.