You don't need a fancy blender for smoothies. I make them almost daily for DC and use a $30 blender from bed bath and beyond.
Combos DC likes:
-yogurt, banana, frozen mixed berries
-kale, strawberry yogurt, melon, blueberries
-apple juice, kale, frozen peaches
-frozen pineapple, blueberries, strawberries
-water, frozen mixed berries, kale
-pear, yogurt, frozen blueberries
-water, watermelon, honeydew melon
-vanilla yogurt, frozen peaches, kale
-spinach, apples, splash of OJ and crushed ice
DC uses a sippy cup. I blend everything on high and use the liquidify option. The smoothies are never too thick for him.