Look at the Omniblend V. I think it is around $100-$150 cheaper and we have definitely found it worth the money. I use a lot of cashew nuts and my previous blender could not blend them to a fine grain (when some stock or water was added), this one can quite easily. But they are quite noisy. The Omniblend is not quite as good at pulverising them to a really thick puree as the Omniblend - that's a case of you get what you pay for, but it does puree them enough for me to make a soft cashew nut cheese with them, just not a hard cashew nut cheese. Otherwise I am more than happy with the Omniblend V I have.
I think the choice comes down to the Vitamix, the Blendtec or the Omniblend assuming you need a really high speed one that can 'murder' most things.
Now all i need to do is save up for a magimix....