Its really up to you. As you mention, gmeplay is smoother, so you can clearly see the difference, and that's ok. Also your RIG will last you longer, you can easly play games on highest possible settings from now to, lets say 2018 or even longer. 720p is a ps3, wiiu and xb360 res, even some next-gen titles like battlefield 4 works in native 720p. I am using my ps3 from 5 years, and 720p is nice. You can always turn on best AA (its impossible on consoles. Imo lack of AA is more annoying than lower resolution) to achieve more crispy view.