I voted for Intel for two main reasons:
1) You said gaming CPU, where i5 currently dominates while Ryzen 7 1700 will be an overkill
2) both i5 6500 and i5 7500 are cheaper than Ryzen 7 1700
In real world scenario, Ryzen 7 1700 is far, far more powerful than any existing i5 variant, but also more expensive.
dominate in gaming is an exaggeration, heck i even used a i3-4130T with sucess for gaming (adequately paired with a 750Ti which was enough for 1080p too)... in fact it's barely visible and yes a 1700 is more powerful than a i5 and prolly cost 100$ more but it's not his counterpart
... his counterpart are a same price 4C/8T for the price level (and gaming performances ... ) and a 1000$+ 8C/16T in term of workstation use ...
(thought, i for one also consider a i7 as Overkill in gaming ... tho you never know what you will do later that could use the excess of power ... which technically did lead me to consider a 6700K/7700K later ... but now AMD as a far better offer imho )
obviously since gaming is implied the fact that a 1700 @ 3.9ghz produce the same fps at a +/-5-10 variation than a 5.0ghz 7700K does not make a i5 dominate a 1700
that being said ... it can only go better with time passing ... sooooo where is the issue with the 1700 again? the fact that it's Ryzen from AMD? or it's not labelled Intel on it?
OP is playing games @1080p with a R9 390! A fast i5 is good enough even for a future graphic card upgrade with a K CPU.
Why would you burn a hole in your pocket on a 16 thread AMD CPU with an expensive motherboard now,
which you practically don't need at the moment? It doesn't even perform that well at 1080p for gaming.
OP isn't running a server lol! It isn't the time yet that games are fully optimized for a 16 thread CPU.
nah he can technically wait on the R3 and R5 Ryzen ... and still go the Ryzen way
for me too a 8C/16T would be too much ... but i rather take that option than change, as i've planned, my 6600K for a 6700K/7700K if Ryzen proven to be a failure ... and it's not the case.
oh well i will probably have a 6900K for the price of a 6700K if i do that ... very bad move indeed [warning sarcasme]
expensive mobo ... for once i disagree
in stock at my retailer in example : Gigabyte AORUS X370 Gaming 5 : 224chf = a little cheaper than my Gaming 7 (279) and even has the same shroud on the IO and sound that my Gaming 7
WOOPS overexpensive indeed (wait ... actually it's same pricing ... +/-50chf )
the most expensives mobo barely reach the price of my Z170X Gaming 7 ... and seemingly offer a little more for the price... (i am quite surprised i have to confess ... nonetheless )
bundle from my E-tailer : a ASUS PRIME X370 a R7 1700 and 16gb DDR4 (2400 unfortunately but 2X8) for 679chf .... i've seen way worse bundle from Intel at the same E-tailer (thought the mobo is nothing like the one that follow )
and that one looks beautiful
same price league as my Gaming 7 : AORUS Gaming K7 (too black ... i rather go the Gaming 5 way) and ASRock Taichi (exactly what i need in term of color scheme ... but the AORUS Gaming 5 has enough white to be valid too )
cheaper than the Gaming 5 but still packing quit a lot (180chf~ meaning at last 99chf cheaper than my Z170X Gaming 7) and also a nice color scheme: ASRock X370 Killer SLI