Ugh. So many mistakes in this thread. Let me clear up the misconceptions.
1) The digital audio and Quicksilver '01 models are almost identical other than the appearance. They use essentially the same motherboard.
2) All PowerMac G4s of the Quicksilver '01 and earlier revisions are limited to 128 GB hard drives. The Quicksilver '02 model (800, 933, dual 1 GHz) was the first PowerMac to remove this limit.
3) Getting a Radeon 9200 would be a TERRIBLE decision, since it uses PCI instead of AGP. You need AGP for Quartz Extreme acceleration. I would personally suggest either a Radeon 8500 (cheap, low end), a GeForce 4 Titanium (best for gaming, ADC support), or a modded Radeon 9600 Pro (CoreImage support). Personally I'd go with the 9600 Pro, since it's fanless and supports CoreImage, and you can get them for very cheap from
www.macsales.com.
4) You don't need a USB 2.0 or FW800 PCI card. Really... why would you need one? It's a totally unnecessary expense.
5) DVD burners are cheap if you look in the right places. Use the drive compatibility database at
www.xlr8yourmac.com to find which ones work with Patchburn 3, or just buy a Pioneer from
www.newegg.com and use that. Or just keep the standard optical drive, which probably isn't that bad.
Please people, unless you really understand what you're talking about, you should not post as if what you're saying is the gospel truth. Instead of saying that ALL Quicksilvers support big drives because they have in your personal experience, you should say that it's only anecdotal evidence. Or that they do, but only with a hack.
Also, I'd recommend buying a Serial ATA card. They're around $60 and will let you use new SATA drives. Of course, you can find a regular ATA/133 card that is Mac compatible on NewEgg for around $50-$60 as well. So get whichever one you like.