Some friends and i had a lot of fun back and forthing on this topic.
It's november of 2005, the xbox 360 has just been released, if you had an unlimited budget for consumer hardware but were limited by the hardware of the time, what would be your 'console killer'
Nothing. I would buy 12 consoles before I ever would have even thought about building a pc at that point.
The pc market was absolute turd back then. It was not until 2007 when the core 2 duos/quads came out that building a pc was worthwhile again.
And it was even later still when seriously good titles started to come to the pc.
The AMD FX processors of that day were incredible bits of hardware. If it's november of 2005, I wait 2 months to pick up an FX-60 processor and a pair of X1900XTX gpus.
Not even going to begin to explain all the different things you just got wrong.
Anyway, to answer the OP's question:
Athlon 64 FX-57
Scythe Shogun (120mm stack cooler)
DFI LANParty NF4 SLI-DR
4x512MB Corsair XMS DDR-400 CL2
SLI GeForce 7800 GTX 512MB
OCZ ModStream 520
Antec Sonata II
And I'll backup @crazymobster on the idea that waiting for another 2-4 months at that point would have been a huge benefit, since AM2 launched as well as the X1900 series / X1800 Crossfire. Of course the emergence of the Core 2 Duo wasn't much later (July 2006) so there you go.
2006 was a very landmark year for PC gaming in general, with the first shader based GPUs hitting the scene on top of DDR2, and dual-core CPUs from both companies in the 65nm node.