Hey, I'd be the first that wants a G5 (the dual-proc, mind you...), but...
As Rene said, HD is the bottleneck, so DTOX won't profit as much. However, if I had that much processing power, why should I want to compress and get worse quality? I'd go with re-encoding. Shouldn't take that much longer
OTOH, is there any software for the Mac that comes even close to CCE?
No, I think I'd wait for a dual or quad Opteron in a few months. Shouldn't be more expensive either.
Or look at it this way:
G5(the fast one) = $3000 = 200 DVDs = 1.000 high quality DVD-Rs.
I rest my case.