Hi, I really am naive about iMacs but really want one. I have a friend willing to sell one to me for 330$ the specs are: Apple IMac 21" core2duo 3.4ghz, 4gb, 500gb wireless keyboard and mouse Sierra os, photoshop, office. It's fully functional and is running the newest os but memory can be upgraded. I'm am a junior in high school so will really only use for homework assignments, YouTube, internet browsing and my GoPro. Is it a good deal?