The Note 10.1 would certainly be a very lightweight and relatively affordable solution to the drawing dilemma. If you want a Windows 8 convertible with touch, an active digitizer/pen and a backlit keyboard, the Sony Vaio Duo 11 is the best pick right now. It uses and N-Trig rather than Wacom digitizer but the features and pretty much the same. I have one and I love it. It's also powerful enough to be your primary computer. We have a review on our site.
The old Dell Windows 7 with the flip screen was a slow Intel Atom machine that I wouldn't recommend. It was a budget product vs. the premium XPS 12.
The Lenovo IdeaPad Yoga lacks an active digitizer + pen combo. If a machine doesn't ship with an active digitizer, there's no way to use a Wacom or N-Trig pen. Your only alternative is to go with a separate Wacom pad connected via the USB port, but then you don't get to draw directly on the work of art.