Well if you think 12" is too small and 15.4" is too large, you are definately wanting to go with the E1405. It's 14.1" screen size and should provide a solid 4hours of battery life on the large battery option.
Here's the breakdown of the Pricing/Options/Specs for you:
Chassis
222-1631E1405,CORE SOLO T1300(1.66GHZ)S$859.00
222-1632E1405,CORE DUO T2300(1.66GHZ)S$959.00
222-1633E1405,CORE DUO T2400(1.83GHZ)S$1,159.00
222-1634E1405,CORE DUO T2500(2.00GHZ)S$1,359.00
222-1635E1405,CORE DUO T2600(2.16GHZ)S$1,505.00
Memory
311-5845256MB,DDR2,533MHZ,1 DIMM,I640M/E1405V$0.00
311-5846512MB,DDR2,533MHZ,2 DIMM,I640M/E1405V$100.00
311-5847512MB,DDR2,533MHZ,1 DIMM,I640M/E1405V$40.00
311-5848768MB,DDR2,533MHZ,2 DIMM,I640M/E1405V$125.00
311-58491GB,DDR2,533MHZ,2 DIMM,I640M/E1405V$225.00
311-58501GB,DDR2,533MHZ,1 DIMM,I640M/E1405V$140.00
311-58511.5GB,DDR2,533MHZ,2 DIMM,I640M/E1405V$225.00
311-58522GB,DDR2,533MHZ,2 DIMM,I640M/E1405V$325.00
311-58532GB,DDR2,533MHZ,1 DIMM,I640M/E1405V$415.00
311-58544GB,DDR2,533MHZ,2 DIMM,I640M/E1405V$1,000.00
311-58551GB,DDR2,667MHZ,2 DIMM,I640M/E1405V$225.00
311-58562GB,DDR2,667MHZ,2 DIMM,I640M/E1405V$325.00
311-58574GB,DDR2,667MHZ,2 DIMM,I640M/E1405V$1,000.00
Battery
312-041180 WHR,9-CELL,LION,PRIM BATT,I640M/E1405V$0.00
312-041253 WHR,6-CELL,LION,PRIM BATT,I640M/E1405V$49.00
312-041380 WHR,9-CELL,LION,ADD BATT,I640M/E1405V$59.00
312-041453 WHR,6-CELL,LION,ADD BATT,I640M/E1405V$99.00
Optical Drive
313-404924X COMBO CD-RW/DVD,I640M/E1405V$0.00
313-40508X DVD+/-RW DRIVE,I640M/E1405V$79.00
Screen
320-469614.1 INCH WXGA,I640M/E1405V$0.00
320-469714.1 INCH TRUELIFE,WXGA+,I640M/E1405V$25.00
Video
320-4698INTEL INTEGRATED GMA950,I640M/E1405V$0.00
Hard Drive
341-320840GB HARD DRIVE,I640M/E1405 (5400RPM)V$0.00
341-320960GB HARD DRIVE,I640M/E1405 (5400RPM)V$49.00
341-321080GB HARD DRIVE,I640M/E1405 (5400RPM)V$79.00
341-3211100GB HARD DRIVE,I640M/E1405 (5400RPM)V$139.00
341-321260GB HARD DRIVE,I640M/E1405 (7200RPM)V$159.00
341-321380GB HARD DRIVE,I640M/E1405 (7200RPM)V$399.00
341-3214100GB HARD DRIVE,I640M/E1405 (7200RPM)V$599.00
Floppy
341-3215EXT USB FLOPPY DRIVE,I640M/E1405V$49.00
Bluetooth
430-1559INT 350 BLUETOOTH WRLESS,I640M/E1405V$49.00
Wireless
430-1560INTEL PRO/WRLS 3945,A/G,DC,I640M/E1405V$25.00
430-1567DELL WRLS 1390,G,SC,I640M/E1405,ROWV$0.00
430-1568DELL WRLS 1490,A/G,DC,I640M/E1405V$15.00
Ethernet
430-1574INTEGRATED NIC AND MODEM,I640M/E1405V$0.00
I believe that come launch time they'll raise the price of the WXGA+ TrueLife upgrade to 50$/75$/100$, but for now that is the price of the upgrade that is heading for the website.
You won't get anything in the way of graphics options (which is just fine for school work) and you'll have plenty of RAM/Hard Drive options to cover you.
Get the 1gig of RAM because the Intel GMA950 graphics can use upto 224megs of RAM on it's own. Beyond that, I'd say get the Battery upgrade, the minimum Core Duo CPU, and 60-80gig 5400rpm HD; you should be good to go.
You'll end up with a price of around 1500$ with tax and shipping but with the majority of the deals that will be out during the launch timeframe of the E1405, you should easily get that price down to 1000$ with coupon codes.