There's a few things you need to know about buying a headset.
The first is that you shouldn't do it. You're paying insane prices compared to buying an equivalent pair of headphones and separate mic. Yes there are cheap headsets, but they are still bad value for the money.
The price is higher than you should be shooting for if all you want is something to chat around on, and the sound quality is not good enough for professional productions - unless you've got a seriously deep wallet. Plus there's the whole "Replacing the whole thing if half of it breaks" with headsets.
Now that we've established that you don't want to buy a headset, you need to figure out if you're getting a new pair of headphones, a mic or both.
For headphones, my personal recommendation is the Sennheiser HD555. Great all-round headphones, does gaming and all forms of music well. A tad expensive for many, I know. I see it as an investment.
For mics, I doubt any of you have use for anything fancy. If you want to conserve table space, I suggest a Zalman Mic1. You can probably find it cheaper than this, I just took the first english-language result I found on google. If taking up some space on your desk isn't a problem... Honestly, most mics above 10 dollars will do fine. It's not like the 90s and early 00s where you were likely to pick something up that would make your friends ears bleed.
I see word of my arrival precedes me. Stop stealing my thunder, you ass
But more important than any of that, even if you disregard my advice and go for a headset, never buy a sound product marketed to gamers. "Gaming" class sound does not mean good. Gaming class sound is when they take a 20 dollar headset, paint it black and red, and sell it for 40 or 50. This isn't like mousepads or gaming mice in that it's an industry focused on gaming devices. Razer, Steelseries and such companies are not good headphone manufacturers.