best way to pick one is to look which has all three of the following.
the best screen. (1080p IPS would be the best option, however those are only present at the +-900 dollar pricemark)
the best battery life (aka review comparing)
cpu/storage. (i3/i5 and HDD + caching or a dedicated SSD?)
this perhaps?
http://www.newegg.com/Product/Produc...82E16834300026 ( it ain't anything special but should get the job done)
then again for an ultrabook with some decent hardware/lifetime expectancy the budget is kinda on the low side. (unless you don't mind no sdd/average battery life/crappy screen quality)
Also if just for papers how about a the new nexus 7 (2013) with a keyboard if mostly used for taking notes/writing papers?