Are the G5s price-competitive with SMP 64bit Athlons?
Dual 1.8GHz G5/160GB/512MB = $3000
Dual 2GHz Opteron/36GB Raptor/1GB/19" display = $3500 from Polywell
That looks really close to me. The G5 is a little bit slower chip, but otherwise it looks like a push to me, with the benchmark results I'm seeing.