Which Earphones Will Sound Better? Options

[Tall-Guy]

Hello,

My Microsoft PC Headphones are dying, and it's time to upgrade my PC Gaming Kit. I was reading good reviews about the 'Steelseries Sibiria V2 USB headphones', and it's about the price range I was looking for. I'm also the owner of Ultrasone HFI-550' headphones I get from a friend few years ago - Those are being connected to my TV set (headphones jack) and I mainly use them for Playstation 3 games and watching movies.

I probably going to use the 'better' headphones with my TV and Playstation 3, as I use it more often. I'm pretty bad with all those technical details, can someone please tell me which headphones should 'technically' sound better? Here is the spec for both:

Sibira:
50mm speakers
Frequency response: 18 – 28,000 Hz
Impedance: 32 Ohm
SPL@ 1kHz, 1 Vrms: 112 dB

HFI-550:
Headphones Type Headphones - Binaural
Headphones Form FactorEar-cup
Headphones Technology Dynamic
Connectivity Technology Wired
Sound Output Mode Stereo
Response Bandwidth 15 - 22000 Hz
Sensitivity 100 dB
Impedance 64 Ohm
Diaphragm Mylar - 2 in

Also, the headphone jack of my TV hissing quite a lot, and I don't think I'm actually using the full power of the headphones without a real amp. I was thinking of getting a DAC like Astro Mixamp, but it's too expensive at the moment. Would Fiio E3 or E6 would be good enough to power it up to fully enjoy the Headphones and prevent the hissing? or do I need something 'stronger'?

Thanks you.

[Tall-Guy]

I think, this:

http://www.amazon.com/FiiO-D3-Digital-Conv...1918&sr=8-4

would fit your tv digital out (I´ve got one myself, connected to my pc ).

But those does not include an amp right? I will still need an amp for any of those headphones to fully enjoy them?