Please guide me on choosing a netbook

Hello to all,
i want to buy a netbook and after some few
searches,i found these three netbooks but i'm a bit confused as to which one to go for.So guys,please advise which one is better in terms of performance,battery life,features & upgradability:

1.Acer Aspire One 722
Acer Aspire One 722 Netbook: Flipkart.com: Compare, Review Acer Netbook

2.Dell Inspiron M101Z
Dell Inspiron M101Z AMD/ 2GB/ 320GB/ DOS Netbook: Flipkart.com: Compare, Review Dell Netbook

3.Sony VAIO YB Series VPCYB35AN
Sony VAIO YB Series VPCYB35AN Laptop: Flipkart.com: Compare, Review Sony Notebook

es1) What is your budget? (INR or USD)
-18k-22k

2) What size notebook would you prefer?
-Ultraportable; 11" - 12” screen

3) Which country will you buying this notebook? Also state that if Amazon.com or Newgg.com ships to your country (Only if you know this info).
-India

4) Are there any brands that you prefer or any you really don't like?
a. Like:HP,Dell,SonyVaio,Acer
b. Dislike:Wipro,Samsung

5) What are the primary tasks will you be performing with this notebook?
-Surfing,MsOffice,HD videos

6) Will you be taking the notebook with you to different places, leaving it on your desk or both?
-Both

7) Will you be playing games on your notebook? If so, please state which games or types of games?
-No.

8) How many hours of battery life do you need?
-More than 3hrs

9) Would you prefer to see the notebooks you're considering before purchasing it or buying a notebook on-line without seeing it is OK?
-Offline first but if it is not available then will certainly buy it online

10) What OS do you prefer? Windows (XP or Vista or Windows 7), Mac OS, Linux, etc.
-Windows 7
Screen Specifics

11) What screen resolution(s) would you prefer?
-1366 x 768
 
Top Bottom