[quote name='Draekon']1) There is no co-op play in the campaign, it must be played solo. Custom maps or other official multiplayer maps can be played with "teams" or in "co-op" depending on how you see it.
2) You would need two separate copies because it goes through Battle.net (internet required) and doesn't allow the same key to connect at the same time. There may be ways around it in the future, but those are illegal.
3) Your CPU, RAM, OS, Sound are all fine. Your video card can probably run it on low end settings, but it would be recommended that you get a PCI-E x16 (1.0, it's not a 2.0 slot) card (that your power supply can handle) if you want to play it relatively well.
EDIT: I should probably fully note that while you can use many 2.0 PCI-E video cards in a 1.0 slot (but not all), it won't run faster than the 1.0 slot allows which is half the speed of 2.0.[/QUOTE]
Thank you very much for the replies. That extra note at the end was another question I had as well since I was just considering getting a 2.0 card if it would work so I could just transfer it to my next board. I have a antec 650 earthwatts power supply. Am I likely to run into problems with a new video card with this supply? FYI I would not want to spent more than $200 on a vid card if at all possible and much less than that as possible. (HDMI out 1784x1004 i think. when I use 1920x1080 on my tv it goes off the screen.. wasn't able to play red alert on my tv because of this...)
Basically I am just looking to play SC2 fairly well, not crysis or something. Again thanks for any and all help.