Help me build! Gaming / Movie PC

I do apologize, but I will need some upper limit in terms of budget. "Cheaper the better" is true for most people.

I'll answer your other questions in the meantime.

Monitors: Some of them can cost a lot. I would not look for any cheaper than $400. So you can buy a large expensive one or for about the same price, you can buy three 23" to 24" monitors. PLS is rather new technology. I personally have not tested it myself yet, but from what I've seen, it offers higher brightness and lower power consumption. Outside of that, it works just as well as IPS. I don't event know many monitors of the PLS variety.

Memory: Considering that all games play within 8GB of RAM currently, upgrading to 16GB is almost a personal preference. But if you plan to run a lot of applications in the background or virtual machines, that 16GB can help go a long way. I have builds with 8GB and 16GB and outside of running virtual machines, I've never once broke the 8GB threshold.

CPU: From an Intel Core i5 to Intel Core i7, you gain access to Hyper-Threading technology. In short, you get 4 additional virtual cores. For gaming, this upgrade has very little to no gain. Most games do not support Hyper-Threading as of right now and only a select few do. I can't speak for the future, but I do not think Hyper-Threading will be popularized for gaming within the next few years. I would go for the i7 if you are a heavy multi-tasker and or run multiple virtual machines.

What is your budget?
My rule of thumb for a balanced gamer is to budget twice the cpu cost for the graphics card.

I like the QNIX. You can find it on ebay for $310 shipped directly from Korea.
I would ignore IPS and PLS differences. The technologies have negligible impact .

On the cpu, the i7 offers hyperthreading. The extra $100 or so offers little to the gamer. Games rarely use more than 2-3 cores so the extra threads go largely unused. I5-4670K is as good as it gets for gaming.
The "K" suffix designates a cpu with a unlocked multiplier. It allows you to increase the clock rate from the default34 to 40 or beyond with a suitable aftermarket cooler. That is about a 20% increase in compute power for a 5% increase in cpu cost. A good deal.

No game, by itself will use more than 2-3gb of ram. 8gb is the norm. But, ram is cheap, and I like 16gb. Windows will keep more code in ram available for instant reuse. There is no need for superfast ram or fancy heat spreaders, DDR3 1600 or 1866 in a 2 x 8gb low profile kit is fine.

sli(nvidia) or crossfire(amd) are means to harness the power of two graphics cards to deliver faster fps to a single monitor.

Here is my canned rant on planning for dual cards:
-----------------------------Start of rant----------------------------------------------------
Dual graphics cards vs. a good single card.

a) How good do you really need to be?
A single GTX650/ti or 7770 can give you good performance at 1920 x 1200 in most games.

A single GTX660 or 7850 will give you excellent performance at 1920 x 1200 in most games.
Even 2560 x 1600 will be good with lowered detail.
A single gtx690,7990, GTX780ti or R9-290X is about as good as it gets for a single card.

Only if you are looking at triple monitor gaming, or a 4k monitor, might sli/cf will be needed.
Even that is now changing with triple monitor support on top end cards and stronger single card solutions.

b) The costs for a single card are lower.
You require a less expensive motherboard; no need for sli/cf or multiple pci-e slots.
Even a ITX motherboard will do.

Your psu costs are less.
A GTX660 needs a 430w psu, even a GTX780 only needs a 575w psu.
When you add another card to the mix, plan on adding 200w to your psu requirements.

Even the most power hungry GTX690 only needs 620w, or a 7990 needs 700w.

Case cooling becomes more of an issue with dual cards.
That means a more expensive case with more and stronger fans.
You will also look at more noise.

c) Dual gpu's do not always render their half of the display in sync, causing microstuttering. It is an annoying effect.
The benefit of higher benchmark fps can be offset, particularly with lower tier cards.
Read this: http://www.tomshardware.com/reviews/radeon-geforce-stutter-crossfire,2995.html

d) dual gpu support is dependent on the driver. Not all games can benefit from dual cards.

e) dual cards up front reduces your option to get another card for an upgrade. Not that I suggest you plan for that.
It will often be the case that replacing your current card with a newer gen card will offer a better upgrade path.
The Maxwell and amd 8000 or 9000 series are due next year.
-------------------------------End of rant-----------------------------------------------------------

Good quality RAM and Samsung makes some of the best SSDs on the market. If you want G.Skill RAM, go for it. They are also good. Not a lot of arguments on what RAM to use really outside of latency, CAS, and overclockability.

And yeah, I live in Boston. #BostonStrong!

Which Kingston one? The Hyper3K is a good one.