Plantronics Closed and Open models, respectively:
http://www.amazon.com/dp/B001E45XT4/?tag=neogaf0e-20
http://www.amazon.com/dp/B001KUSXXU/?tag=neogaf0e-20
I like Plantronics headsets. Usually pretty comfortable, and they've got decent sound and mic quality for the price. You can move higher up to better Sennheiser headphones, but you'll be spending a lot more for small improvements. In the end, it just depends on how much of an audiophile you are. Avoid Logitech and Creative...they make some of the worst headphones I have had the displeasure of listening to.
I've also been very interested in trying out this headset:
http://www.amazon.com/dp/B0041RRNLC/?tag=neogaf0e-20
More expensive, of course, but Corsair has been on a roll with all of their products lately, so I wouldn't be surprised if it's decent. Maybe check out reviews for that one if you're looking to go a little higher end. Looks supremely comfortable (which is the most important attribute to gaming headphones, tbh).
As for mouse, I'll go ahead and recommend the MX 518:
http://www.amazon.com/dp/B0007Z1M50/?tag=neogaf0e-20
The G500 is an option as well if you rather get a laser mouse:
http://www.amazon.com/dp/B002J9GDXI/?tag=neogaf0e-20
Some people will undoubtedly recommend the Razer Deathadder:
http://www.amazon.com/dp/B002Q4U5DK/?tag=neogaf0e-20
I have the Mamba, the wireless version of the Deathadder. While the form and performance are incredible, the build quality is rather lacking, IMO. By forward thumb button has gotten loose, my mouse wheel squeaks a bit, and it loses connection sometimes (where I have to reconnect it to get it working again).
As for keyboard, it's mostly personal preference. I'll go ahead and recommend my favorite:
http://www.amazon.com/dp/B001F51G16/?tag=neogaf0e-20
Very elegant look, supremely quiet, and extremely comfortable to use. The backlight is also fantastic, with very little bleed around the keys. The keys are like larger laptop keys, but with a more refined and longer throw. The action is so quiet, and yet the tactile feedback is fantastic. There's a very decisive rubbery 'click' when you press the keys. Razer has a similar keyboard (Lycosis), but again, I'm not convinced of their build/driver quality.
Other keyboards to consider would be the Logitech G11 if you want macro keys and a more traditional keyboard, and something like a Steelseries keyboard if you want a plane jane mechanical keyboard (which produces a very mechanical clicky sound).