Have you looked at the Opteron yet?
What about it?
A dual Opteron 1.4GHz vs a single 800 Mhz G4 A1(Debian Linux)

Comparing a 64bit system to 32bit system???
The problem with X86 market there’s always a price point for delivering a solution.
One may have to wait for SIS, VIA and nVidia based solutions. I don’t have faith on Newsys in regards to making the market as a commodity. (What do you expect from ex-IBM engineers).
Lets see Newsys survives the Taiwanese/nVidia assault…
Trouble is, Debian doesn't have an x86-64 branch ready yet...
What about Debian Linux X86-32, SuSE AMD64, Windows 2003 Server X86-32 (includes PSE 36bit support)?
Building an Opteron system from pricewatch.com
(in USD).
CPU: $ 299 Opteron @ 1.4Ghz (OEM).
Motherboard: $ 525, MSI K8DMaster-F (AMD built chipset).
Total: $824 USD OR ~$1,276.02 AUD.
(I'll find cheap K8 Taiwanese brand later )
Do you know a pricewatch like website for PPC?
From
http://www.vesalia.de/?V02b0f1553554e12795d59545208514e01101f0954414752050140090a1e31115479633a223c6373744e03263f2a2a7661053964606222687c2e3475551a71297b0d6e5a45500b6e4G4 7451@800MHz AmigaOne-XE (includes AOS4(when it's completed), Debian Linux).
Total: $937.27 USD
I'll look for better G4 7451@800MHz AmigaOne-XE. package.
I wonder IF Amiga.org can host pricewatch.com like website for PPC market.
From
http://www.eyetech.co.uk/search.php?SearchStr=&SearchCat=AMA1(Any shopping features like Dell.com (sigh))
Total:
500 UKP(minus VAT) for AmigaOne-XE m/b w/ G4 7451@800MHz cpu.
Via
http://www.xe.com/ucc/convert.cgiTotal:
$803.408 USD (with no VAT) OR $1,243.99 AUD
$944.062 USD (with VAT) OR $1,461.87 AUD
Once SIS, VIA( and nVidia enters the Opteron market those AMD K8 chipsets would be expensive by comparison. Aggressive competition should lower down the prices.