hey guys I saw the 128 ssd MacBook Pro 2017 on sale on amazon for $1188 I was wondering if I could purchase this model along with a 250 gb ssdT5 Samsung external hard drive for $125 to cut down on expenses... the 256 model is $1479... I am a medical student so I mainly plan on typing up documents and reading slides / E books as well as watching videos. Additionally I plan to keep the laptop for 5 years