What kind of Ram should I buy to upgrade?

I currently have an early 2011 13- inch MacBook Pro

Processor 2.3 Ghz intel core i5

Memory 4GB 1333 MHz DDR3

Graphics Intel HD graphics 3000 384 MB

Software OSX 10.9.1 (13B42)

I'm looking to upgrade my Ram as I'm going to be running Logic Pro X

So my question is what kind should I be looking to get? And is 8gb gonna be and adequate amount for running Logic Pro X?