Those are headphones, I'm after headsets.
I've bought the senn 558 and speedlink clip mic.
Decent choice, although I'd seriously recommend a headphone amp along with the choice of headphones...
Some things to consider (on the cheaper end):
- FiiO E5 / E6
- FiiO E11 (DAC as well)
- Anything by "Little Dot" (Google them) Edit: In fact, start here: http://www.littledot.net/forum/viewtopic.php?f=9&t=821&sid=f49dcfcc9508828dee8e99de0e43c547
Im sorry, but a £40 mic and headphone set will be much better than any £90 headset.
Buy the Siberia V2 and every panda on the planet will simultaneously cry. God awful drivers and sound quality - even if they are very comfortable.
£90 will get you some Audio Technica ATH-AD700s. These are legendary amongst gamers and music lovers alike for their incredible comfort and awesome positional accuracy.
I'd say as a rule that getting as much of the audio equipment out of your PC case as you can is a good thing, as there is a lot of potential electrical interference in there...
So for that reason, I'd recommend getting an external amp, over upgrading your card.