Your only limitations are your imagination and the specs of your PC..
Maya is (imho) the best 3D app on the planet, with XSI coming in 2nd. max is the bottom of my list, as the UI sux.
Chris (formerly R@nSiD)
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When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)