Common thread in this thread OP is that you have to give many parameters. For anyone who's just giving you speaker names, you can go to any site and look up speakers for under X amount, however no one knows what your room is or what your whole system is.
I can easily tell you to get a pair of Vandersteen 1's (new) as they don't smear and they are better than many speakers in that range that aren't quite as room dependent, plus they will be fuller range than most of the monitors that you will see in that range. Awesome bass for the price and neutral mids. Some of the best reviews out there if you Google them.
That said, they may or may not be your cup of tea. There are some monitors that will be great too, but what type of music are you listening to. If you run the CV's you possibly like rock and play loudly. If so, you need a speaker that will do that. You would probably want a fuller range speaker too.
If you are serious about your question, please come back and just start to talk to everyone. You'll get the same list of speakers from most of the posters, but you may get some great info to put you in the right direction. What part of the country are you in? Many of us have great dealers we love and can get you to some good folks who can help you make the right decision.
Just saying.....