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DDR2 ram prices have gone up a good bit over the past couple of years.
Here's a nice kit that isn't too high.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231151

I'd be really tempted to go with something like the GTX650 Ti Boost. It's a huge performance boost over the 8800GT.
Here's one I like....