G4 tower build

Okay, I got ripped off on the G5 tower I purchased on CL. Since it will be a very long time until I can afford another, I need advice to cobble together a machine. I have a G4 Digital Audio tower, a G4 Mac server, and the dead G5 tower.

Here are the parts I have decided I am going to use:
Pioneer DVD+/-RW (from the G5 tower)
ATI Radeon 9 series, 64MB RAM
2x 512MB PC133 RAM (I also have a 256MB stick, so I could go to 1.25GB RAM)
250 zip Drive (I even have 4 unopened zip100 disks!)
2x Apple Maxtor 40GB hdds

Now for the question:
I have a G4 Digital Audio board with a 733Mhz CPU (256kL2, 1MB L3) and a G4 Mac server board with dual 533Mhz CPUs (1mbL2). They both have cases, but do not have airport cards. I will be running Leopard. The DP533 has a higher geekbench (538 vs 429,) but the 733 is only slightly less than the Leopard minimum requirements.

What board should I use? What is the best AGP 4x card I can pick up?

The 733MHz and stick with Tiger. Leopard will be that slow it will seem like it is being strangled. And Leopard will not install natively on any machine with less than an 867MHz processor, and even on a dual 533MHz is still 533MHz.

Both machines can handle up to 1.5GB memory, but make sure your modules are Mac compatible low density modules and not the cheaper high density used by PC. You will get kernel panics.

It's strange... I put the ram and vid card into the DP533 and only scored a 496 on geekbench.

That is about right with wear and tear. When brand new the 533MHz DP recorded 542 with Benchtest.

well it looks as if a mere 70 geekbench difference, the 733 has more L1/L2, and the PSU on the DP533 makes a lot of noise. The 733 is starting to look better.