For me, the third would be best as the tech used is within todays tech as the 8500 is the 8 generation and can game very well. The 3770 is an older CPU and Yes, it is an I7 but is an 3rd Generation CPU and the memory used is not better than the memory used on the 8500. It is easy to go with the I7 and the specs it has but I tend to look beyond that and buy what is going to be around the longest. You may be able to get by the I7 for an a while however time may not on its side as the tech is getting older The I7 can still pack an punch but its punch may not be as strong as when it first came out. The I7s are strong but unless you into crunching numbers or rocket science that may be excellent but I5s can help you get your gaming on. However it is going to be an purchase that must be carefully thought out and cost may play into your consideration. If you ask me I would go with three if you can do w/o an SSD or bigger hard drive which you can add on later if your budget allows it. I do believe the I5-8500 though is going to be higher as it is an 8th generation CPU