Well, this ram is cheaper and better than G.Skill's value ram; http://pcpartpicker.com/part/mushkin-memory-996995 .
Try and put more money up and get the Seagate Barracuda 500Gb, it's like 55$. That goes for all of the builds.
I'd WOULD go for an APU build because that processor is better than a pentium or any of those older intel processors anyways, but I don't think it can crossfire with any of the 7000 series cards, so I guess the AMD Phenom build is the best. I'd use the Ram I suggested for it though.
every one is being dumb. dont go apu that is not future proof. get the am3 quad. its a black edition so you can overclock it decently. Phenom>pentium. that quad will not bottleneck your gpu either so you will be fine there. try to get 2x4 gb of ddr3. uses less power then 4 sticks and you can upgrade to 16gb later. no fanboism here. that quad is better then the dual in gaming and will be more then sufficient for games with that 7850.
Where are you getting 37fps? the video has the following benchmarks.
Arma2 Bench mark 1 = 23fps
Arma2 Benchmark 2 = 11fps
OA Benchmark = 24fps
And with a better GPU then you plan on getting.
I certainly didn't say "the GPU sucked", the 7850 is a really good card for the money, but stock vs stock GTX 660 TI will give you better FPS.
And im not sure why you posted the video of someone using a Intel Core i7 & 7850, as a comparison your planed rig, taking into account how CPU demanding Arma2 is?
if he gets the build i sent him which is similar to the one he has, in march dont get the 8 core, get another 7850. that will give you screaming frames in all games. the fx-83XX may have better multi tasking but core per core the phenom 965 will win. and seeing how games use only 2-4 cores upgrading to the fx-83XX wont give you the frame boost you would expect to see. I would get another 7850 and slap a cpu cooler on your phenom and overclock it past 4ghz. by the way the 7850s overclock extremley well and get nice boosts from it.
I don't understand you pc people. I just recently switch over to pc from console and im currently playing planetside 2 at 30 fps and it looks perfectly fine.
I would be just fine playing games on 720p on low-medium settings. The reason i am going for a 7850 is that i want to be somewhat future proof for a year or two.