I am looking for a phone to hold me over until the next Gen of iPhone come out this fall. Going to buy used since I will only use this phone for 8 months. Narrowed it down to the 64 GB 8 plus (around $650) and the 128gb 7 plus (just under $500). 64gb is enough space for me so the extra room on the 7+ isn't that much of a benefit. For those prices, which phone would you buy? Is the speed difference worth the difference in price?