Questions about headset and mice.

Hi everyone I'm thinking about buying the Steelseries Siberia V2 headset and the Razer Lachesis 5600 mouse, and I have a few questions.

Should I buy the Steelseries Siberia V2 USB (soundcard) or without the soundcard?
Is the Razer Lachesis 5600 mouse durable and comfortable?
Is it worth the money? Right now I have a cheap and crappy headset so I want to get a new one for gaming, music, chatting etc. :)

Sorry for my bad english.

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