Mac Pro or iMac? Benefit of Mac Pro not clear

I have an older G5 PowerPC tower, which I bought back when the performance difference between it and an iMac was significant. But as I ponder replacing it, I am having a hard time seeing the benefits vs. cost of the Mac Pro tower. Other than expandability, is the Quad-Core processor that much better than the iMac's Core 2 duo? Assuming that expandability is not important to me, why should I consider the Mac Pro over the iMac? Here are two examples from a current MacMall catalog:
• 27-inch iMac, 3.06 GHz Core 2 duo processor, 4 GB RAM, 1 TB hard drive, $1,694
• Mac Pro, 2.66 GHz Quad-Core processor, 3 GB RAM, 1 TB hard drive, $2,594
Why should I consider spending $900 more for the Mac Pro, especially when it has less RAM and an apparently slower processor?

Terry,
Just to add to this, I just recently got a 2.66 single-quad core nehalem 2009 mac pro.. and just a few days ago I received my core i7-975 desktop processor and was able to remove the xeon w3520 or 2.66 and replace the ecc memory with non-ecc memory and everything works great. So, you do have options.. you are not bound to use xeon processors or ecc memory, as for my purposes the desktop core i7-975 which the xeon equi is w3580 - this is the same processor Apple charges royally for at the apple store.. I bought both processor and memory for like 500 dollars - saving a lot of money..
The Hatter, a pc builder will tell you that the 2009 quad-core singles use standard OEM INTEL processors with integrated heatsinks.. while the duals are lidless and don't use oem.
This is good news if one is trying to save a lot of money on a processor upgrade..

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Chipset Model:          ATI Radeon HD 2600
Type:          GPU
Bus:          PCIe
Slot:          Slot-1
PCIe Lane Width:          x16
VRAM (Total):          256 MB
Vendor:          ATI (0x1002)
Device ID:          0x9588
Revision ID:          0x0000
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EFI Driver Version:          01.00.252
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Pixel Depth:          32-Bit Color (ARGB8888)
Display Serial Number:          939LK3NA01178
Main Display:          Yes
Mirror:          Off
Online:          Yes
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Hi
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Mac Pro or iMac? Benefit of Mac Pro not clear

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