Hi I am a student, and I purchased the surface go 4gb ram model. I really like the product as it's lightweight and suits my needs, but I am wondering if paying 150 more for 8gb of ram is really necessary. I only use the product for HW, occasionally some light gaming, reading and watching movies/videos. It is my main device but I am a minimalist. Would you say it is good enough for me? And how long do you think it would last me for in comparison to the 8gb model? Thank you.