Well raptori, the beginning of your post makes no sense.... "does the Ear Force HPA2 5.1 still good competitor what should I consider...". But I can manage as I am pretty sure I get what you're asking.
The HPA2 5.1 was by far the best gaming headset I had experience with (see the OP for my reviews)...but even the cheaper JVC HARX700's were better...though they were driven by an old Sound Blaster sound card...onboard is horrid in comparison from my experience. That CAN make a difference with gaming headsets and true headphones. I still support and stand behind the get the cheaper headphones, get the cheap Zalman Clip-on mic when you have a sound card or even also get a sound card for the same price as a mid-high-end headset and in reality but MUCH happier with sound volume, quality, position, ability and pretty much every area for much longer with much better durability (JVC HARX700 vs HPA2 for example...I have had both).
Step one, get a damn sound card...many will say no..but in reality they have cleaner output power which translates into better sound, crisper, deeper, higher, harder hitting, larger sounding, etc....then get the headphones...get what you can. Gaming headsets are good, and some are getting better...but I've still yet to hear any gaming headset that would deter me away from STILL recommending the JVC HARX700 + Zalman clip-on mic + old Creative X-Fi Xtreme Music combo...gaming headsets are the easy way...and for many work well and are good enough...until they hear what the same money could've achieved...then like me you're annoyed with lesser decisions and move on, do it right and get over it. Not all gaming headsets blow...but you'll spend dearly to attain one worth it and really "true 5.1" while impressive isn't great, and when an X-Fi with emulation and stereo headphones does just as good for less overall...why not go that route?
Just some food for thought. Please do read the OP, I have multiple links to different posted reviews in this thread along with my reviews in the OP.