W700? EOL already

P3 actually was the cheapo replacement for W700 (which has nicer screen and better build ...

).
Yup, P3 don't have microSD slot. So you need to connect to external storage via USB 3 port.
Depends on your usage. If you open 1 application at a time, don't do anything too heavy (just MS Word, browse internet, ... ), then Bay Trail is sufficient.
You said only word processing for academic usage, I take it your academic pursuit does not involve any software that need to manipulate large pool of data, or mulit-media, ...?
T100 also come with MS Office, iinm. So you may save some money there as well.
If you prefer more traditional form factor, then can consider:
Acer
V5-131-10074G50, 1007U + Intel HD@RM1149, 4GB, 500GB, W8SL
Asus
X201E-KX178D/9D , Intel 1007U + Intel HD@RM999, 2GB, 500GB, FreeDOS, 1 year
Dell
Inspiron 11, Celeron 2955U + Intel HD + (1366x768;touch)@RM1299, 2GB, 500GB(5400rpm), W8
lol.. didnt know that W700 EOL already cause i still saw it on acer website. well, i plan to use it mainly for portability cause i got another laptop, Asus N55SF which is too heavy and bulky to bring to uni so most of the time i leave it at home for gaming and multimedia purposes. In terms of academic usage, i am looking at word/excel/ppt plus browser with many tabs for information finding. maybe some minimal movie watching and game during free time