My experience with blenders as been that Vita Mix is the superior blender, now they have several types of blenders as you have noted. Not sure what the Vita Mix Bar Boss is, but if it has a timer and no sound enclosure we call it a MP Blender w/ timer. Then their is the MP Blending station and also the T&G2 Blending Station. I would chose one or the other based on price and nothing else. They both have sound enclosure and are digital and they both blend great. Make sure you get two jars. Not trying to sway you, but their are companies out their that will sell the blenders at a great price and you get free products, plus two jars. If you are not getting this offer, then e-mail me personally and I will direct you to one that has this offer.
The blend tec is also a great blender and the prices are very similiar. If this company is only going to give you one jar with the Vita Mix and two with the Blend Tec and you want to continue to purchase your blender from them, then I would go with the one that has a sound enclosure called the Smoother and get the two jars.
Two jars really come in handy, especially when you are busy and need to make a fruit smoothie and then turn around and make a frozen coffee drink, saves you time from having to wash out the jar each time.
I am pretty sure most of the blenders will fit a 110 outlet.
Hope you find this helpful!!