From experience with P4 and P5, I can offer some help. In P4, V3(and other DAZ models) will work just fine. However, P4 doesn't have dynamic cloth or hair like P5/P6. Plus the material room for P5/6 is miles ahead of P4 as far as texturing options (displacement maps,etc). OTOH, it seems that P4 is still the most stable of all Poser versions, given the large number of problem threads involving versions 5 & 6. And as far as rendering options, I can't speak for P6 but, in P5 the Firefly engine is basically a waste of coding (IMO). Nine times out of ten it-just-does-not-WORK! Great concept(raytraced shadows, reflections) but, ya better get a good supply of Valium before trying to use ol' Firefly seriously ;) Honestly Bruno, unless you really need the dynamic stuff or the fancy lights(AO/IBL in Poser6), I'd say go with Poser4 (Artist). Hope this helps.

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AMD FX-9590 4.7ghz 8-core, 32gb of RAM, Win7 64bit, nVidia GeForce GTX 760

PoserPro2012, Photoshop CS4 and Magix Music Maker

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...and when the day is dawning...I have to say goodbye...a last look back into...your broken eyes.