Good headphones are hard to beat in the same price range as speakers, but then speakers are alot easier. Personally I like the Sennheiser HD-25-1 a lot.
I use the Sony 7509HD, and I like them a lot.
As for speakers, there are a lot of choices, and they can vary from $100 to $10,000 a pair. One thing is for sure, don't get the Behringer's. Very good for a budget, but if you want good reference monitoring, nothing beats visiting a pro-audio music store and trying them yourself. Your ear will know. What I like, or what others like, might, and certainly won't be what you like.
assuming you have a pro audio interface.
from good to better
KRK RP5 we sell a lot of these for video as they are decent yet affordable $275ish
Yamaha HS50M just a tad more $350ish
Yamaha MSP5 $450ish
Adam A5X 875ish
note these are all 5" cones and are usually plenty for video obviously there are others and bigger including surround set ups