Need help for a new headset/headphone.

if you're not an audiophile then you really do not need to spend a whole lot on headphones to be happy.

while the dt990 is an excellent set of headphones, you will need an amp with them (yes, despite you having good onboard sound) which would push your total bill up around $300 (without a mic). a bit much for a non audiophile (though still cheap when it comes to headphones!)

the dt990 would destroy the hxc2, but we are also talking about two vastly different price ranges as well.

if you're comfortable spending that kind of money, the dt990 really is a nice set of cans. very open and wide soundstage, good clarity, good bass despite it being open cans, good comfort. they have a v shaped sound signature (slightly reduced mids). the only con really is that they are hard to drive (needs a good amp) and that they are a bit harsh (however harsh can also be called detailed so its not really a con, just a different way of saying they are good for fine detail)

an example of a smoother headphone would be the hd600/650 or hd598 which arent as harsh but arent as detailed either. more of a laid back headphone.

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on the cheap end of things i'd say you may be happy with the sennheiser hd518 paired up with a microphone (if you needed a mic) like the zalman clip on, moovmic or modmic.

for a little more you might like the hd558 or hd598.

the sennheiser range goes from hd518->558->598 and goes from bassier to neutral and from lower soundstange and quality to higher soundstage and quality as you follow that line. the drivers are the exact same in all 3 models, the difference in sound comes from the construction of the headphones and grille designs.