Plextor has better read/write speeds so go for it. If you are looking for 512gb, the link I sent you was the cheapest because retina macbook uses different kind of SSD which is not cheap.

 

http://www.newegg.com/Product/Product.aspx?Item=N82E16820148613&ParentOnly=1

 

My personal choice would be this one. Although others might choose differently.

Ok thanks guys, this topic is over, I'm going with this one, just a larger version of what Danny suggested! Thanks again for all who pitched in!

 

http://eshop.macsales.com/item/Other%20World%20Computing/SSDAP12R480/