Complex scenes will always take a long time to render. If you're waiting 10 hours for a scene on your PC then the best PC in the world would probably only do it in 4. Still no difference if you render overnight. That said, if you're going to upgrade, go for CPU and memory and go for the biggest / best on the market, otherwise they'll be out of date in 5 minutes flat. Having said that, last image "Treacle" took 7 minutes to render :) I went for a coffee, came back and it had finished. Because most of it is postworked then I figured there's no point waiting 10 hours for a few softer pixels or something, so I saved time by rendering on default. Of course you can't do this with animation but personally this is the way I intend to go, just using Bryce / Poser to produce a template image that I then procede to f*ck up with my mouse. :)))))))))