Unless you want to buy another Vitamix soon, don't. There are transformers that will power it, but you will burn the motor out very, very quickly -- a Vitamix draws an enormous amount of power and the way they function includes a power surge at the beginning of the cycle when you push the button. You will blow up any converter that is too small -- which even includes the cheaper 3,000w ones.
You are better off storing it in the US or selling it in the US, biting the bullet and buying a new one here. I do use my KitchenAid stand mixer with a transformer, but I got it for $20 at a yard sale and so abusing it isn't so much of a loss to me and when it goes I'll replace it. I cannot use my KitchenAid food processor as it has blown up every converter we've tried. Your Vitamix is in the same category.
If you do decide to attempt it with your Vitamix, you will basically need an industrial-capacity transformer -- the kind they use for powering construction equipment.
Other electronics aren't nearly so bad. We use our US TV and sound system, and DH has masses of music and recording equipment that works perfectly fine with the transformers. It's things with motors that will wear out more quickly, and those that use the most power like blenders, food processors, etc are the worse of that bunch -- if you like those things, replace them unless you don't mind the wear and tear the voltage conversion will place on them.
