I currently have 8 GB of RAM on my laptop and am hoping to upgrade to at least 16 GB and have a total of 2 open RAM slots. I was hoping to get advice as to whether adding more than 16 GB is suggested. Also wanted to know what brand and clock speed on the RAM cards I should purchase. I currently have 1600 MHz clock speed on the factory installed cards. Budget is around $200 but would prefer to keep it around the $120 to $150 mark. Thank you in advance for any help.