I don't know. I like the precision because its pretty much the old school XPS series (XPS2 and M1710). I don't particularly like the M6400 but I'm sure I could get used to it unlike the M1730.
Well, at least for me, the precision models don't get the same discounts for students and alums. It was pretty much XPS or nada. I'd love to get a precision but not unless I can get the UCLA discount on it.