I like the Inspiron 14 too. 15.6" screens seem a bit bigger than necessary for a laptop IMO. Moreover, the new Inspiron 14 comes with 64-bit Windows 7. I am not aware of the graphics card included with those laptops though, because I don't play games.
There is one more difference between Inspiron 14 and 15. The DVD drive of Inspiron 14 is tray style, i.e. the tray comes out and you put the disc and push the tray in manually. In Inspiron 15, you just put the disc inside, no tray comes out. You cannot use those half-size discs with Inspiron 15 though.