I see one build has an i5-4440 and an R9 290 which is really not bad at all but the power supply is at doubt, case is quite small for an R9 290 and the motherboard is really a budget thingy.
Do you need convincing? Builds 3 and 4 looks great, I support going for build 3 with a better PSU, take the suggestions above! You're going to be able to play any game on High if not Ultra for 2 years to come, in which case you can upgrade to a GTX 1370? Or a R13 266O (If the world doesn't blow up )
personally, I'd go with a better CPU and a more future - proof motherboard with more opportunities to upgrade the PC further in future. I wouldn't mind going a bit lower to the R9 280x since the both the R9 280x and GTX 970 already can max most games at 1080p, but of course, the GTX 970 is better.
No point in trying to get future proof mobo, and stuff, as skylake is coming 2016, and new line of FX processors, where ddr4 will start to become mainstream.