Macbook Pro Mid 2010, 15" Upgrade
I currently have a Mid 2010 MacBook Pro, 15". 500GB SATA Disk, 4GB DDR3 1067MHz, 2.53GHz Intel Core i5. It has recently started to be very slow. I really like this computer for all the ports it has (It has a CD drive which I use for watching movies and burning CDs, and Thunderbolt, SD slot, USB 3, etc.). Overall it's been a great computer, but it's time for an upgrade. I'm going to be going to University next fall and need a reliable computer. Should I invest the money to get another reliable computer or should I consider upgrading the computer I have? On MacSales.com I could spend $438 USD, including shipping, and get a kit to upgrade my 500gb hard drive to a 500GB SSD Drive, upgrade to 8GB RAM, and a fresh battery (My current battery has 900 cycles).
500GB HD to 500GB SSD
4GB RAM to 8GB RAM
New Battery
Or, alternatively, should I invest in a new computer altogether? Looking at prices, I realize I'd be willing to drop to a 13" and 256GB Storage, but I think I would want to go maximum RAM since I'm tired of a slow computer and the new MacBooks I've heard don't have upgradable storage. So Potentially, maybe a 2015 MBP 13" 16GB Memory with 256GB Storage. Buying this computer refurbished or used I could save some money.
Anybody have an expert opinion? Would upgrading my current computer refresh it's lifespan? Would it last me another four years of university?
MacBook, macOS Sierra (10.12.6), 2.53Ghz IntelCore i5;4GB1067MHzDDR3