From the recommended basic to the more expensive and advanced active noise cancelling headsets, we believe these represent the best options.
Just perform a search for the product you are looking for to find the best deal. We frequently use MyPilotStore.com.
Considerably less expensive than the Bose headset, but still a great choice that includes Bluetooth connectivity, the Zulu 3 headset (now replaced by the new Lightspeed Delta Zulu headset) is what we recommend first:

For a budget-friendly headset that doesn’t have active noise cancelling, but is becoming popular in the aviation community, the Kore Aviation KA-1 headset is a solid choice:

When price is not a consideration and you want the top-of-the-line aviation headset, the Bose A20/A30 is the one to get and has all the bells and whistles with a price to match:
