So my 17" 1.8 ghz imac is on the way and i'm pretty excited about it. It was on the sale site on apple store (before the updated ones came out last week) so its got 256 mb of RAM and I need some more for it and I've been shopping around online at crucial, memoryx, and other places. The best deal I've found is this from newegg for two 512 sticks. http://www.newegg.com/Product/Product.asp?Item=N82E16820145440 I have two questions, though. First, is this stuff compatible with my computer? All the specs seem right to me but other sites ask for your computer model etc. and give you options, I called newegg and they said they can't help me with that. Second, I'll be doing some light graphics stuff and dvd stuff but otherwise not much heavy duty. Will I be good for a while with 1 gb of RAM or should I go for a single 1 gig stick for now to add to my 256 and add another one later? Thanks for the help. I'm new to macs so I appreciate it.