ok. i like your explanation.
i know where you are coming from, and i'll tell you exactly what and why:
1) a g-sync monitor and a g-sync video card
this assures you will get CRT-like performance. no lag, no tearing. you need to spend, but not *that* much.
a gtx 970 should be more than enough. if you want to play games like battlefield at very high detail and resolution, you might consider a 980.. but as most of us who want to compete cut down blur, godrays, door fade, and all other visual clutter, i think a 970 will be plenty for a few years.
there are plenty options for the monitor. the king until now was the asus PG-Q, but new alternatives have come out which are maybe even better. the difference is the resolution; consider that high resolution effectively lowers framerate potential.
for visually simple games, any resolution is ok, a 970 will max them.
for visually demanding games, either go 1920x1080, or get a 980.
using two 970s instead of a 980 is a possibility, but the efficiency of SLI is not guaranteed, specially if you play unusual games, non-AA titles.
i still think a single 970 is enough. i own a 770 and play BF3 without ANY issues - i'm talking "competitive", not "it looks good".
2) a 4790k CPU is *enough*.
enough doesn't really explain it. a few years ago it meant just "enough", today it means "you will not see a difference unless you set up an unusual situation specifically designed to stress that component".
you can have a 4770k, a 4650k, a 4440, and you will not be able to feel a difference until you push them to the limit. can a game push these to the limit?
as i have said before, some (few) games can, more so if you chose to pump the resolution and the visual quality.. but generally speaking, NO. you cannot push even a i5-4440 at 1080p in most competitive games.
the 4790k is a great chip, it will hold its value for long time, and will keep its edge for slightly longer; but when this chip gets old, you will already have replaced it.
please dont compare modern chips to pentiums. these haswells are not "barely sufficient" for modern day usage, as they were years ago. you can brutalize these chips with tons of open apps and they will perform flawlessly.
3) ram is practically irrelevant. <<<<<<<<
does ram have a measurable effect in all applications? yes.
is spending more on ram a sensible choice? no.
as long as you buy 8Gb of decent 1866 ram you will not feel the difference (again, at a competitive level, not at a "i play minecraft" level) with any 3200 ram.
16Gb ? sure, why not. you won't need it, but the memory controller won't have any issue running it. have fun.
4) get a good desk, a great mousepad and one of the mice from "the only aceeptable mice" list. and a good chair, too.
position the monitor at nearly eye level (centered), and work on the ergonomics.
like many, i recommend the zowie fk1.
the deathadder, g400s, and a whole bunch of other mice are also acceptable, there is a BIG thread about that somewhere already.
5) a SSD because HDDs are foul.
yeah ok seriously, you cannot imagine what difference a ssd makes until you have one.
6) get a GOOD internet connection. one with low contention ratio. one where you dont lose 25% of your packets, so, not Virgin.
that is it. you cannot get this setup and then blame the hardware. this is the peak of technology for gamers.