Well of course the SSD isn't going to increase gameplay performance XD

I was wondering why I'm being told my video card is "no good" for ArmA 2, when in fact it is among one of the newer models of video cards and will allow me to play on high settings.

No need for fibre optic (to the home, anyway), yet. I easily get 5MB/s on cable internet and that's not even close to their highest tier (they currently have 1Gbps cable internet in my area). That's around 17-18GB an hour for me. So FTTH is not really necessary unless you're using DSL since regular phone lines can't get those kinds of speeds.

It's a high mid-range card with a 128-bit memory bus. I don't know about ArmA 2, personally, but it should be able to run most games nowadays on medium to high settings as long as the resolution isn't too high. Still, I'd be leary of even that card with the power supply you have. Rosewill is a budget brand and the card lists a minimum 450W PSU, which is what that is. The low powered i3 should help with system load, but the PSU even outside of this is combo is included with the case and neither the newegg page or the manufacturers page is giving me any detailed specs on it. Since I don't have any information on the 12V rails I couldn't tell you if it will even run that card reliably.

The card you linked will be fine to play ARMA 2. I've got an earlier generation of the same card the HD 5770 and whilst I've not played ARMA 2 I've played games with similar system requirements on decent settings with no problems.

The system requirements for ARMA 2 recommends that you have a Intel Duel Core CPU, 2GB Ram and a HD 4850 or above, so the system you've linked and graphic card are fine.

Unless those games have the same engine that doesn't mean much. Those specs developers give out are just preliminary and "cut out" so it actually work.

I'm not entirely sure on his requirements when it comes to performance and graphics but if he wants both high a cheap card is not going to cut it.

If anything, developers would exaggerate hardware requirements. What incentive would they have to underexaggerate them?

The more people that think the game will run on their system, the wider their potential market will be. It won't matter much to them if the game doesn't actually run properly, as long as they make you think it will long enough to get your money.

I just threw away a working 600W Rosewill power supply last week because I didn't trust it. That's coming from a person who is not above salvaging parts found on the curb. Take it for what it's worth.

Rosewill doesn't make power supplies. While it's certainly possible you could pick up a bargain it's probably safest to assume that it was made by whoever was the low bid that particular week. Avoid unless you know who the OEM is or something specific about the characteristics of that particular model.
Why putz around with SSDs? No SSD comes close to the speed of RAM. All you need is a UPS to keep power hiccups at bay and ECC to protect against cosmic rays. :0)

I just found out it's approved by Tom's hardware. So you have three expert opinions, one from a somewhat experienced computer gamer, one from Mathieu at Hardware Revolution, and now Tom's hardware.
All doubt about the PSUs reliablility is now for not.

If developers outright lied about recommended specs, and remember we aren't talking about even minimum specs here, there would be consequences. The PC market is very hard to please. They demand honesty and integrity, or they hit the forums and create a shitstorm.
If developers lied about recommended specs we'd all know about it, because it would be all over forums.
You're making an assumption based off of not a whole lot.

Also I have 3 different people, one of them being Mathieu who is an expert, saying that this video card is even more than fine for playing ArmA 2.