I like your site, very clean looking. I agree mostly with your predictions, although I believe bitcoin won't appreciate quite as much as you are predicting. I'm guessing a target price of $1500-2000. However, this would also mean a decrease in volatility, which will make bitcoin more suitable as a currency.
I'm curious if you would be willing to speculate which alt coins other than PPC will make the top five. Do you consider ethereum and ripple alt coins or something else altogether? I believe one of the most interesting things to follow this year will be coins/systems which do indeed offer true innovations and are not just a blatant ripoff of the bitcoin codebase.
Edit: Also, I predict that Amazon will not begin to accept bitcoin this year.