You're right that ram is more expensive than most, and you don't need 8GB for dolphin either. You could also get good performance from an i3 since dolphin only uses 2 cores. Here's one for $125
http://www.newegg.com/Product/Product.as...6819116946
Good luck with your build.
http://www.newegg.com/Product/Product.as...6819116946
Good luck with your build.