+1 for the corsair HS1
i bought myself an HS1A (same as HS1 but without the inbuilt sound card, and runs off analogue instead of USB) after doing quite a bit of research. reviews and price on ocuk are great for both products.
my reason for getting the HS1A instead of the HS1 is that i have a nice sound card so i wanted to make use of it. if you have the HS1, it doesn't use your sound card so may sound worse or better than the HS1A depending on how good/crap your sound card is.