Well, your graphics card is only used by P6's preview mode, and it's not totally necessary. (Any Open GL card should do) P6's Firefly rendering engine takes some getting used to, but it's really not that bad. With the wealth of P6's features, mainly in rendering and procedural shaders, I think you'll be very happy. (Not to mention Image Based Lighting and Ambient Occlusion) If you're not interested in photorealistic renders, then Poser 4 or even the free DAZ Studio will suit your needs.