berzelius

Get a 1050 Ti. My girlfriend has an A8-5500 and they work well together. For comparison, I'm running the same GPU with an i5-3330 and we get similar performance on most games. CPU bound games like strategy games reveal the bottleneck on her machine, but we're generally happy with the performance. Anything above a 1050 Ti is probably a waste with that CPU. 

some games do bottleneck even with a 470 which is less powerful than both GPU you intend to upgrade to. 
I had a client with an APU A10 7860k and overwatch made it hit 100% with a 470. 
 
In short: yes, you will bottleneck it.
1050Ti or 470 is as far as i'd go with that CPU. 

In day to day use, they'll perform almost identically. You'll only notice a difference in benchmarks and when writing large (several GB) files to the drive, and that's assuming the source drive can be read from faster than the SanDisk can write. 

no it wont

Have you checked the cpu temp in the bios? If I use mine and restart it shows around 37. At 93 I don't think the cpu would even work. I have not used either hw monitor or Speccy. Just the bios. Hope this helps.

Get the V2 model cause if you are unlucky you get one that will not support the CPU without a BIOS update...
http://eu.msi.com/product/mb/#?tag=M-ATX%20AMD
You can get a V1 model but you never know what BIOS version it got...
 
Worst that could happen is that you most order a chip from MSI!

http://www.anandtech.com/show/7677/amd-kaveri-review-a8-7600-a10-7850k
​Great review of the a8 7600.
 
Advantage of the 860 is you can swap the dGPU to the new build in two years, and it will be faster.
 
Advantage of the A8 is when you upgrade you will have a great HTPC with gaming capability(important when married:))
 
Lower initial cost, can use cheaper PSU, and if there is a problem you don't have to figure out if it is the dGPU, gpu driver etc....if there is a problem it is the cpu or mb and that's it.
 
Will still function as a 860 if you get a dgpu down the line.
 
I have a 7850k and it plays every game I throw at it. The A8 has the same steamroller cores and a few less gpu cores but in raw fps the two are very close. And yes I am biased.
 
With the g3258 your throwing away 60 bucks when you upgrade and it won't play newer games. Also cpu's last longer then motherboards, my x3 is on it's 3rd mb.
 
Nena is one of the smartest people on this forum and one of the nicest, I do disagree with her over the choice between 860k or an A8 or A10 APU