I also suggest Wings. It has lots of features and if you get the plugin suite for it, there's tons of extra options if you want them.

As a standalone app for modelling, it's absolute simplicity to use.  I made my first Dalek after playing around with Wings for around a month.  I think I followed one simple tutorial at first, then tried every tool and function to see what they'd do.

Best of all, it's free. 

Coppula eam se non posit acceptera jocularum.

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