The most used appliance in our kitchen is a Nutri Bullet.
We use it to make low fat milkshakes (Frozen Yogurt, Fruit - Bananas with or without frozen strawberries, and low fat milk).
I use it almost every day to make a smoothie.
Frozen apples: I found some on sale at Jungle Jim's (49 cents a lb.) last November, so I bought a bunch, cut them up and froze them. They work fine in the blender and they're in every smoothie.
Frozen blueberries. Wild ones from Kroger.
Fresh fruit: Today it was strawberries and a small pear.
Protein powder: One scoop of vanilla whey protein powder from target - 25 grams!
Milk: Today was 1% skim. I frequently use water. Just depends on my mood.
And no smoothie would be officially complete without...
Vegetables: Today it was kale. I alternate between kale and baby spinach, because I can't taste either one of them. I have tried celery but it doesn't work for me. I can't taste it in the smoothie, but I burp it up for an hour afterwards.
The Nutri Bullet people say half fruit and half vegetables. I'm not there yet. And I'll probably never get there. I'm at my target weight and body fat percentage. I see no reason to alter the taste of the smoothie.
Speaking of taste - it's delicious. It tastes like a milkshake. That's what keeps me coming back. I like the fact that it's healthy, but I LOVE the fact that it's delicious.
By the way - a Ninja is a perfectly acceptable choice. I just found the Nutri Bullet on sale with a lot of accessories.