Poser 7 already contains a figure called Sydney, which is better than V4.   I do think that you need the RDNA head and body morphs (from www.runtimedna.com, or www.contentparadise.com), or the Dimension3D morphs (on sale here) for greatest ease of use, although extensive morphing of Sydney within Poser 7 is possible.   It's true that the mountain of material for V4 dwarfs the hillock of stuff dedicated to Sydney, but, in absolute terms, Sydney really isn't short of things to wear (ContentParadise is a much better hunting-ground for Sydney material than Renderosity, it must be said).   Add Wardrobe Wizard, and La Syd can steal anybody's clothes (apart from the emperor's new ones, obviously).