my babies and some trick for the room (tubetraps behind the mics, something on the rear wall)

 

Funny you should bring this up, since I've been getting my headphone situation nailed-down of late.
(Prices cited were purchases from musiciansfriend.com)

Sennheiser HD201 - at about $20, they have a very well-balanced sound and can be good for tracking vocals, though you might want to hold them more snugly to the head for less leakage/more isolation. A great bargain, for how they sound.
Sennheiser HD280 (Pro) - at $100 (sometimes less), they provide excellent isolation, and are very comfortable - and have a very well-balanced sound, with everything clear/nothing muddy in the audio.
Tascam TH-300X - about $40, though often priced higher. I like their feel, but the bass/low-midrange is too prominent for critical listening.
AKG K240 - $50 for a great, classic, industry-standard pair of "cans," with clear, even sound - though (semi-) open-back, and therefore not good for isolation from other sounds nor preventing leakage into a vocal mic - unless the vocalist is standing at a distance. The most comfortable of this lot.
Sennheiser HD570 (discontinued) - great open-back headphones; just about the same in sound characteristics as the AKG K240, but quieter.

I have both open- and closed-back headphones because of their difference in sound. Open-back (or semi-open-back) headphones sound more "natural" when listening to music, while the closed-back ones sound more "realistic," if that makes sense. Listening with closed-back 'phones puts more pressure on the eardrums, but with them one can listen more carefully at lower volume. For recording vocals, definitely get closed-back ones.

 

Maybe my ears have gotten used to them. I think if my memory is correct they were rather bright when I first got them or it was that I could hear everything clearly.

 

you can sing with studio monitors in the studio If you invert the phase. I've done it and heard it. Not as much "isolation", but enough you can work with if you have to. But it reduces perceived bleed from cans, too.