MSI X600 vs. Dell Studio 15

Hey all

I'm looking for a new laptop (prefer a larger screen than netbook size), and the choice stands between an MSI X600 with the SU3500 intel processor, or a Dell Studio 15 with a T4300 intel processor.
The two both have 4 gigs of ram, a 15,6" screen and the same harddisk space.

The Asus UL30A and UX50V are also possibilities, yes somehow they cost the same where I live:P The UL30A has a 13.3" display and the SU7300 processor, and the UX50V has a 15,6" display and the SU3500 processor.

MSI X600: http://eu.msi.com/index.php?func=proddesc&maincat_no=135&cat2_no=&cat3_no=∏_no=1855

Dell Studio 15: http://www.dell.com/us/en/home/notebooks/laptop-studio-1555/pd.aspx?refid=laptop-studio-1555&s=dhs&cs=19&ref=lthp

Asus UL30A: http://www.asus.dk/product.aspx?P_ID=8CwAK6XZ0pekc7aI

Asus UX50V: http://www.asus.dk/product.aspx?P_ID=CT2eXjXd9FYeDzPE

The laptop's main purpose will be school related stuff like handling word documents and such. I found the X600 nice because it's so light and thin, (same with the Asus ones), therefore it would be easy to carry to school, whereas the Studio 15 has some more musclepower, but I'm not sure I'll need it for the school stuff.

Which one would you advise- considering it's mainly for taking notes and working with word?

Thanks in advance
Corner