Let me just quickly add this and then I'm out of the topic. xD
- >60Hz monitors: I agree with Ryex, I think it's just a fad. The only point where it does make sense is if you are so fast at pressing buttons that shooting or clicking would make a difference in competitive gaming. But otherwise stay away from it.
- 4k monitors: Stay away from it. Full-HD looks great and 4k won't be mainstream for another few years. It's not worth it.
- Monitors in general: You don't need 2 if you don't plan on using it as a work station for software development. If you want it for multimedia and gaming only, one big monitor would be a better choice. And you can always buy second one later if you change your mind.
- CPU: Ryex already said it. AMD will give you cheaper stuff, but if you want cutting edge, Intel is the way to go. But unless you need it for gaming or something other CPU-intensive (game development or compiling code), you might want to consider an AMD after all. Though, if you are going to run a virtual machine, Intel is far better at that.
- GPU: What Ryex said. AMD are the better choice, NVidia is generally overpriced. Especially with DX12 (and Mantle!), AMD will take over the market. They already power both Xbox One and the PS4. Think about that. But SLI and Crossfire aren't worth it. You'll pay double, but the performance will be increased maybe 40%. I've read an article about that stuff. I can't remember where, but there's tons of other problems as well with SLI/Crossfire.
- RAM: Yeah, 16 GB is enough for some time. Also very useful if you want to run VMs. I upgraded my laptop to 16 GB just recently. Worth it. Also lets you open a gazillion tabs in web browsers since for some reason websites these days need 50 MB each to run. >_>
- HDD/SSD: While an SSD will speed up your booting time insanely, don't get it if you just want it for booting. Or get a small one like 128 GB. e.g. At work I have my OS on a 128 GB together with our project files so compilation is faster and VS boots up much faster than on my home laptop. It's really worth it in this case. I'm also planning to get a 500 GB SSD for my home laptop. I'll put the OS on it together with my projects and my VM (booting it up and shutting it down is often a hassle, especially suspending it since it has to dump all 4 GB of RAM onto the HDD and renders my laptop almost unusable for at least 20 minutes).