I currently have a 6s Plus and want to upgrade but im not sure if I should get a 7 Plus or an 8 Plus. I can get a great condition 128GB 7 Plus on eBay for $480-$500 while the 64GB 8 Plus is going for $780-$900. Is the 8 Plus worth the price difference? I plan to upgrade again in September if Apple really does release a Plus version of the X.