AMD is only competitive if: you have a heavily multi-threaded workload or are using Linux.
On Windows, for the purpose of gaming, Intel will hand AMD its ass on a silver platter. That's not to say AMD is entirely incapable, oh no, the problem with AMD is that they're just adequate, especially with the rise of the resolution in already GPU-bound gaming putting more pressure on GPUs than ever before. But for serious gamers and enthusiast, adequate is just unacceptable.
I've notice that AMD tends to be ahead of it's time when it comes to CPUs. The Phenoms had a plethora of L3 cache and unlocked multipliers and while not super competitive at the time, with their cheaper Athlon brethren getting about 90%-95% of the performance of the Phenom IIs, the Phenom II's aged much better than the Athlons, Core 2's and first gen Core iX series on 1156 platform.
AMD anticipated software would move rapidly and opted for a high core count, but apparently software is a lot slower to develop than hardware, as a result AMD's Bulldozer architecture, including Piledriver and the upcoming Excavator don't perform as well due to low IPC and is power hungry and warm thanks to high clock speeds. With parallelization so prevalent on mobile phones, with 10-core chips in the works, I think AMD was onto something, but had a poor implementation (they really should have learned from Intel's Netburst/Pentium 4) and a slow developing software in the desktop/x86 space made the problem worse.
As much as I like AMD's ideas and value, Intel is the way to for now. I'd certainly go for go for a Haswell i7 over an AMD FX if I had the budget for it. We'll see what AMD's Zen architecture will do, as it sounds very promising, but that's at least a year away, assuming no additional delays.
In terms of which mobo, so much crap that used to be on the motherboard is now integrated into the CPU that it really doesn't matter in regards to performance. If it's: a) Z-serie chipset b) has the i/o you need then it's a good motherboard. I'd go for the cheapest Z97 board there is, assuming you don't have any aesthetic needs or features (such as ASUS's AI Suite, SupremeFX sound, expanded I/O via 3rd party controllers, etc.)
As for the GPU, I'd wait for the R9 390. I expect the R9 390 to be better, but even if it isn't, AMD has historically had really aggressive pricing which will likely force NVidia to adjust pricing. It would be a win-win for waiting. Either get a better GPU, or a cheaper 980. Personally, I would be partial to AMD because of Freesync, especially since a I just purchased a Freesync Ultra-Wide monitor.