Huh, good to know about watchdogs, but I would wait to see how much of a difference there is in the benchmarks. Though it is entirely possible that the i7's hyper threading starts getting used.
If sam1050g is interested in the i7 he can drop the maximus hero down to the asus z87-A or he can throw another $100 at this beast for the i7. Or he could stick with the 144hz screen and fit the i7 easily. Personally I don't see the i5 causing a bottleneck but you never know what the future holds for tech requirements.