Blend it

Now that the kitchen is up and running there is one small appliance I miss. About a zillion years ago I tried to make some margaritas and my KitchenAid blender could not cope with the task, it stalled and died. I was very negative about the whole experience and didn't want to spend a couple hundred dollars on something that couldn't even make a drink so I got an immersion bender for sauces, soups and purees and gave up on the whole crushed ice thing. I've since heard that it isn't just me mistreating the appliance - others have had the same experience. Now I'd like to make the occasional smoothie and figure this would be a good time to go ahead and splurge but I want to make sure I'm buying the best heavy-duty blender out there. Amazon has a couple of 900 watt models that should be able to mash bananas and crush ice and a super expensive one that I would expect, for that price, could mix concrete! Do you have any recommendations?