Cinema4D is one of the bigs guys in the market, so the learning curve is a little more complex then Carrara.other thing, to get a great render in Cinema4D you will need a module more called Advanced Render ... well you will end in a U$ 2500 bucks or more if you want hair...
Well Carrara its a great intro level software with a good render (GI, IBL, Radiosity, AO) and hair with a little as U$ 549 or only U$ 384 for Platinum club
If you have the money and want to work with a pro software get XSI (dont know te support for Poser content) or Cinema4D
If you want to play with  Poser content and have fun doing good things like I do get Carrara that is very easy to use.

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