Ear Tools by Equation represent some of the best values in the industry.
The RP-21's are designed to be monitoring headphones for mixing since they have good output and a very flat response with good imaging. They compare favorably with many major brands costing 2-3 times as much.
The RP-15's are similar to the RP-21's, but with a folding design.
The RP-22X's have extended bass response for a pleasant listening experience while keeping the great imaging and clarity of the RP-21's.
The EP-3070's are as good as you can get at the price. A really good sounding budget headphones.