Closed-back monitors would be best if they have a wall right behind. A rear port would tend to bounce sound off the wall, leading to odd reflections that would be tough to deal with. Fortunately, there are plenty of monitors that don't have a rear port, including the Equators I mentioned -- and if your budget is up to $1K/pair, their
D8 model, with an 8" woofer, is worth looking at. $749/pair.
If your room is spacious and well-treated, you should be able to accommodate 8" monitors. Otherwise, 5" (with or without a subwoofer) might work better.
Here's a good list of recommended monitors on GS.
Have fun!
Cheers,
Eddie