Okay first things first, stay the hell away from gaming headsets.
I've went through enough gaming headsets (like 7 I think?) to finally come to conclusion that no, gaming headsets are not good simply because of how much you're paying for them.

Since you are in a small bedroom, your best sort of setup would have to come from a wired headphones connected to a DAC and an amp.
In this case, because we're talking about the PS3 here I assume — the DAC you'll want would be a Turtle Beach DSS or an Astro Mixamp, whichever fits your bill more.

Why a source which would give you virtual surround sound? Because Dolby Headphones work and it works wonders when paired up with a proper headphone. I don't want to make guarantees here since sound is still a subjective thing, but I'm willing to really recommend you a setup like this and if you still prefer something from a gaming headset, my treat for a meal.

Now, what is your budget for a headphone? Depending on what you get, you might not need an amp first because therer are headphones which are pretty easy to drive without needing additional power.
The TB DSS is already out of production, so most that are still selling in LYN here are old stocks at quite an expensive price (unless you can hunt for a cheap second hand?).
Suggest you get one from eBay

Some would suggest to go for an Astro Mixamp instead because it allows you to connect a mic to it for voice chat on the PS3. I personally do not do this as the Astro Mixamp is simply too expensive, even off eBay.
For voice chat on the PS3, I use a bluetooth mic. Yeah, bluetooth mic.

Specifically, an iTech Clip On II which I just clip to my shirt. Set the default audio output device for the bluetooth mic to my system output device (which in this case, the TB DSS) and done! Wireless voice chat through to my headphones, one less wire clutter.
No they're hopeless man.

The cheapest TB wireless headset (X41) that features 2.4/5ghz dual band wireless signal goes for like RM600?
You then content with cheap ass build quality and subpar sound quality.

A cheap wired audiophile Superlux HD681 Evo + TB DSS + Bluetooth mic would go for less than RM600 and I will say this much: will sound heaps better than the TB X41.

Otherwise, like I said to jellybean-fish, meal is on me.
As I explained to your first question, your source would need to come from a surround mix. Which is why you need a virtual surround processor, like a TB DSS.
Yes the M50 is a better heapdhone than the first-gen PS3 headset.

The bass extends deeper without rolling off into nothingness like the PS3 headset before it even touches the sub-bass frequencies. There's no punch in that.
Mids are more forward on the M50 though which results in much better detail but the highs (treble) might be a little bit too harsh/bright for your taste (for me at least, it was) though.

An amplifier is as what it is, an amplifier. A lot of people buy an amp hoping to drastically change and improve a headphone's sound signature. That is simply a wrong misconception.
An amp is there to provide a headphone with clean, un-colored power to it so that when a headphone hits certain frequencies, it doesn't sound like it's crapping out i.e a sudden drop in volume, distortion, or even just being dull sounding over all.
I've never ran into a situation like this since I went with a full wired headphone set up. Volume is controlled for me regardless of what I'm playing or watching.
Sometimes there are games which mixes its audio wrongly though, like in logos many would mix their intros in stereo and then go back to 5.1 in-game assuming you have 5.1 enabled. You could blame that on inconsistency.