what i meant putting a new video card etc etc by "upgrading". and nothing fancy

well i am not in a situvation to have 'fun' overcolcking i guess because i am too busy

so you can assume that i won't try overclocking
basicaly, i want this machine to let me play all the latest strategy games for at least 6 months. so thats why i asked for a higher graphics card... do you feel that the graphic card that you suggested will be enough for RTS games?
and how much would this setup cost me?
1. core 2 duo
2. casing and a good power sup that will be ok with some 'heavy graphics card(may be in the future if i decide to upgrade?)
3. 19 acer flat screen(is this a dumb choice?

)
4. a good mboard(please suggest something, i won't attempt overclocking...)
5. 2gigs of RAM(does the brand matter? is there any speed/type that i should consider?)
6. keyboard mouse and a dvd writer
i got a S.B 5.1 card and a speaker system... so i am planning to use it with this...
thanks anusha for the grate help provided

and all the others too.
please pardon this newbie for asking stupid questions

i read a online vid card review at
http://www.gamespot.com/features/6173135/index.html
they say this card gives the best value for money... how about this? is this a bad choice... is it possible to get this in lk?
GeForce 8800 GTS 640MB
thanks