For over a decade, I've been really big on the Sony MDR-7506 headphones. They're not always the best choice for tracking vocals or drums or anything that involves microphones, because they bleed like crazy despite being closed back, but for monitoring or checking mixes they're the best I've ever used.
And I've used an awful lot of different studio headphones.
I recommend these to everyone! They don't have the best bass response, so if something sounds very bottom-heavy in these phones, it's probably going to cause seismic activity on big speakers. Also, they are very sensitive in the high frequency department, so the tendency is to mix too "dull" to compensate at first. If the highs are slightly harsh in these phones, they're probably pretty good elsewhere.
I also use Ultrasone HFI-450's, mainly for tracking live instruments or vocals. They are the exact opposite of the Sonys. Heavy on the bottom, dull in the treble, hardly bleed at all cause they grip your head like a vise. I also wear them when using power tools in the garage, haha.
For speakers I have my old M-Audio BX8 monitors that I've never really liked since I bought them in 2002, but I've learned to mix on them so I keep them. Both studios where I work have Tannoy Reveal 8" monitors (per my suggestion). Not expensive, but boy do those mixes translate well. Great speakers.