The memory that I had linked before would be a good choice and you can eithr go with a single 4gb stick or get a two stick 8gb kit that would give you matching 4gb sticks for a total of 8gb.
What do you have now? Are you building or upgrading ? More information would be helpful because pretty much any dual channel ram will work that fits in the MB supported ram list. Here's an example;
The memory that I had linked before would be a good choice and you can eithr go with a single 4gb stick or get a two stick 8gb kit that would give you matching 4gb sticks for a total of 8gb.