def get 120- they are pretty cheap these days- I bought the 1 terabyte one and have BOTH windows 7 and linux runnign on it with plenty of room to spare- but that is overkill- but i needed it for photography which take up lots of room
https://www.newegg.com/Product/ProductList.aspx?Submit=ENE&IsNodeId=1&N=100011693%20600414920
One terabyte SSD is about $300. Last time I looked a 500GB SSD was around $250