Bambam, might just be case of a cpu upgrade.

Ive done some Bryce images at 3600x2400 and then printed them out at 30x20 inches and they come out great.

Im lucky none of my images are as complex as yours!, 4-6 hrs tops.

I would seriously wait until we have some sort of confirmation that Bryce 6 uses BOTH cores/cpus then go for a $100 dual core cpu.

Far cheaper in the long run.

:)