I'm not terribly familiar with Brother machines. But unless you embroider, I'd nix the 3rd one.
For my $$, I'd look at this (I do a moderate amount of sewing):
Kenmore 15343.
This is the modern version of the machine I've had for about 25 years. Nothing fancy. Nothing "electronic". A basic, user friendly, low maintenence machine. And right now, you can get $5 off making it $84.99!
I'd love to know which Husqvarna Viking Helen has. Whichever one it is, I envy it...they make awesomely cool sewing machines.