There are two things I'd like to mention, myself:
I bought a Razer Banshee (headset) and a Razer Naga (mouse) and my opinions on the two are this:
1). The Banshee. It has quite simply the most awesome sound I've ever had the pleasure of listening to, though I will have to admit I've not tried its mic yet, as I am no longer in any sort of raiding guild. I should skype my GF or something to see how well it works. I do know, however, that unlike most headphones, it has a USB connection and has a really thick, sturdy cord and it is unlikely to wear out like analog headphones do so often. It was worth every penny of that $120 I paid for it.
2). The Naga. It takes time to get used to all of those buttons, but there's something I love about my Naga right off the bat: The DPI resolution is just insane. I'm a person who has very good motor skills, and can make very fine-tuned movements with my hand, and I found that after using the Naga, I attempted to use a normal mouse and I could see the difference right away. With the Naga, I move the Naga less than an inch to move the cursor from one end of the screen to the other, compared to 1.5-2.5 inches on anyone else's mouse, when both mice have sensitivity set to 100% in-game/Windows. I've only found one thing that I *don't* like about the naga -- if you get dust inside the little 'eye' on the bottom of the mouse, sometimes the cursor will 'stick' and you have to blow it out, and it works best if you have a clean mousepad (I had to replace mine because of this). Otherwise, I'd have to say my Naga was totally worth the $79 I paid for it.