You do have a pretty good voice and you have a good range of different voices as well. I liked the approach of not having a script, even though you should refrain from using the phrase "I guess" so often (I guess :P). Anyway, sometimes voice demos are a mix of what the voice actor has done so far or just a mix of the different voices and sometimes it's a bit hard to follow those demos, since there's no real connection between the differen characters/voices. So it was something new to listen to this demo, without any script whatsoever.
Oh, your high pitched voice (the second voice in this demo) sounds a bit like Mickey Mouse, so you have to be careful not to get sued by Disney. :P
Also, your first "nasty voice" sounded a lot like Eric Cartman, haha.
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