What to choose? MSI 250, Presario V2010EA, Thinkpad...

Hi to all

I want to buy my first laptop, but what to choose?

I want a small laptop (12' or 14' if possible) and under 1000$ if possible?

What do you think about :

Medion SIM2000 (same than MSI 250) http://minilien.com/?SCC6rPV0P r  (ou chez
MSI http://minilien.com/?aIBJIa1KN U)

HP-Compaq Presario V2010EA (http://minilien.com/?yPB8IsXG5 M)950euros

IBM Thinkpad R50E 1834 (http://minilien.com/?1F7eYnBmG o)750euros

Asus A6BG16-RWDL (http://www.materiel.net/detail s_A6BG16-RWDL.html)1200
euros

I really need help  and advices about these laptops or other good models.

Thank you very much by advance,

Philtix