If you are mainly interested in rendering static scenes I'd say you can't go wrong with Carrara5 Standard. The rendering capabilities of Carrara5 Standard and Pro are virtually the same. While both Standard and Pro have animation capabilities, Pro has more tools for the animation and video professional. Pro has Transposer2 built-in,  I figure you can't go wrong either way, but the current bundle/crossgrade offer is an exceptional bargain.