Just be aware that Poser 7 will not use more than 4 GB of RAM, period. Doesn't matter whether you have a 64 bit OS or not. The Poser Pro renderer, however, is full 64bit, and will use more than 4 GB if it's available.
I've run renders on a Q6600 with 8 GB of DDR2 where Poser Pro used close to 7 GB of RAM during the final render. Poser 7 couldn't render the scene.
OS: Windows XP Pro 64 bit.
That was over 15 figures, no clothes, half of the figures with strand-based hair, the rest with transmapped hair, plus a fairly complex environment, using raytraced reflections, soft raytraced point lights and spot lights, and a lot of displacement. Half of the figures were V3 resolution or more, textures were 2048x2048 or more. All figures had different textures.

Even in Poser Pro, the base app is still 32 bits. When scenes get too complicated, it'll hiccup.

Sounds like a REALLY sweet machine for Vue 6 Infinite 64 bit!

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

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