With settings on close to if not the lowest an on a small screen (not a 32" + HDTV) it will run it. I'd recommend another computer for that type of gaming or buy this one an purchase a GPU (Graphics Card) once you save up some more money. You can get a top of the line one for around $150-$225 an you will be set than.

I'm not a gamer, but if u do u need to bump up the RAM.

It does support dual-monitors, actually up to 4 monitors to be precise. Though I'd recommend adding a GPU if you intend on using it that intensely. Far as DVI, it does have a DVI out port so I'm assuming you can use a splitter for the multiple monitors. Not 100% sure though. It also has an HDMI out port if you'd rather go that route..

yes

Asus FM2A55-M/CSM

It has the Socket-type FM2 if you are looking into what kind of CPU or APU you will be able to drop in it upon purchase. It comes with the APU A-10 6700 Radeon HD 8670D which I might add is a fairly decent chip for most people.

Asus motherboard with built in graphics card

basically any standard ATX psu will do. the linked product is the one from bestbuy i bought and it runs my r9 270x in this pc

if you open the case to change the power supply, you will void the warranty.

I bought the evga 600b for mine and it works perfect

It has room yes, not much though.

FM2A55-M/CMS Motherboard if you want to look that up. Here are a few minor details that I'll give you for a quick answer.
2xPCIe x16 slots (16 lanes on 1 and 4 on the others)
1 Fan pin connector on the motherboard an a space for fan installation on the back. Very nice looking inside I might add but nothing out of the ordinary. Has room for a few things. Not a computer you would want to throw too much into as it would get too hot.

FOR MY INTENDED USAGE, SPACE IS MORE THAN ADEQUATE

Yes, that shouldn't be a problem. It found my Netgear router with no problem and Windows 8 makes it very easy.

You can practically buy any graphics card you want as long as it fits. Though I should mention that it might be a good idea to stick with AMD since the APU already has an integrated AMD Radeon HD 8670D.

I'm going to be installing an AMD Radeon R9 270 before too long as long as it fits in the case.

When you buy a graphics card make sure you upgrade your power supply unit (PSU) an install another fan on the extra space for a fan on the back. A graphics card (GPU) is going to add extra heat an the computer is already kinda small. 500-600 watt PSU should do you an I guess any fan will be better than no fan at all.

Good Luck!!!