2048Mb Single 2 Gb module (C2D only) Certified Price Breakthrough $199 or 2048Mb kit (2x1Gb) Corsair Sale $128 Basically I have a 24" C2D and only 1GB in it (512x2). I hear Corsair ram is excellent, anyone know much about Certified? Does it really make a difference? I'd like to spend the extra $70 bucks to get the 2GB single module so then later I can get a 1GB chip and max out my system to 3GB. If I get the 2GB module I'll have a total of 2.5GB if I get the cheaper 2GB (2x1GB sticks) then I'll have only 2GB. Suggestions?