I own the fs315S rather then the E model click here
It would be helpful if you post the 325E specification to help others to comment.
From memory, its 512Mb instead of 1Gb RAM, which should be adequate for Windows XP but not for CAD, some games with intensively heavy grahics, nor editing very large photo files. The lower powered processor may slow up with some games and will really struggle with CAD.
I think the graphics memory also grabs what it can from main RAM memory as well, which is different to the 315S model. This is not helpful at all for CAD, large pic editing and some games.
The 15.4" widescreen LCD screen, DVD, looks is all the same and great IMHO.
Hope that helps and also kicks off more responses to your thread.