You can look into the Toshiba Thrive 8GB:
PC World Review of the Thrive
The external FULL SD card Slot allows you to use SD, SDHC and SDXC Cards (up to 128 GB), easily swap between your PC and the tablets to read your PDFs. Also, the tablets was designed, unlike most other Android Tablets, to be in a portrait mode which maybe be ideal for your needs (You are the judge!). Yes, it is LED back lighted with IPS. The landscape as a 16:9 ratio and you get all the usual Honeycomb 3.1 Hardware (Tegra 2, 1 Gb RAM, 2 mp face camera, 5 MP rear camera
The full size USB port(unlike mini-USB) allows to use any keyboard, or keyboard and mouse combo through a infrared USB Hub, if you need to do word processing or need to use a mouse (LogMeIn).
379$ for the 8GB, 399$ for 16 GB, 429 $ for 32 GB