Two of the P6 features that convinced me to preorder are - point lights; - OpenGL preview. And I suspect there won't be any more service packs for P5, which still has some issues with dynamic hair, and raytraced shadows in large scenes sometimes completely mess up the render. The features mentioned above - especially the point lights! - are worth the upgrade price IMO. Your system is pretty cool, good processing power, good graphics card, and enough RAM. No need to upgrade, and I believe that a significantly faster system than yours will cost a LOT of money. I don't know what disk(s) you have in that box, it might be worth installing one or two WD Raptors (fastest SATA disks on the market right now).

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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