I don't think that there are 4 spaces available for you to put extra RAM in your iMac, the most you can do is replace the two 1gb sticks with two 2gb sticksStick to Crucial brand RAM for a mac.
You will want to find out if you're using So_Dimm or 240pin RAM sticks. The iMac is different. Once you pick something, thumb through the newegg user reviews.
Don't let the folks at Apple scare you into buying their stuff.
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