It's more a benefit of the laptop also being a tablet, with a full keyboard. It charges off a standard USB plug and the portable battery will pretty much double it's battery life if need be :)
I'm actually waiting for the new T100HA that will be coming out when Windows 10 comes out. With 4gb of ram and the new USB type c
Edit: they just added the non refub version http://www.amazon.com/gp/product/B00NC06JRS/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER
The T200 is more expensive than the T100 because the T200 has a 15 inch screen while the T100 has a 10 inch screen.
If you get the T100TA from this link here, it will come with a tablet that has 64gb of storage and it will then have a dock (or keyboard), that has 500gb of storage. I would actually scratch that T200TA, due to the fact that it only has 64gb of tablet storage and know extra storage.
I used to have a laptop and it worked great, but it died recently and I've switched to a desktop and tablet/keyboard dock set up and I way prefer it. I use http://www.amazon.com/Transformer-T100TAM-H1-GM-Detachable-Touchscreen-Laptop/dp/B00NC06JRS at classes and around school, but at home I use a desktop I built myself. Cheaper for the power overall and long term, way easier to upgrade a desktop than a laptop, and a tablet is lighter than a laptop and can do everything I need it to.
Here is what I have. It needs a new charger (dog chewed through the one and I soldered it back together, but they are $30, although it will still work).
Also will throw in this case http://www.amazon.com/gp/product/B00KS2CJN6?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
How does $150 sound? They are going for 200$+ on Amazon used
How about Asus Transformer Book from Amazon
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Have you looked at the ASUS Transformer Book T100?
If that's a little too small you could go with the Asus Transformer book T200 Even though it has less storage.
If you want something on the smaller side (10.1 inches) I would recommend the the Asus Transformer book T100ta.
If you want something in the middle of screen sizes, I would recommend the Lenovo ThinkPad E455.
If you don't like them, let me know and I'll find something else for you.