Help with Inspiron 9300

[icetonez]

I often see posts with the user hooking up external monitors to their 9300. I want to make sure I can use just the laptop's screen to 4 table without overlap. Is this possible and if so, are there any customizations I must make to have this?

For example the default display is:

17 inch UltraSharp™ Wide Screen XGA+ Display.

Do I need to upgrade to this:

17 inch UltraSharp™ Wide Screen UXGA Display with TrueLife™ [add $125 or $4/month1]

Also could someone suggest other upgrades that would be worthwhile. Such as going from 256 ram to 512, or 40gb hard drive to 60+. And primary battery 6 cell v. 9 cell ect. Oh and video card, that looks important too. As you can tell I don't know much about computers. Any help would be great.