You can buy a really nice expensive set other monitors for up to half their original price at
http://app.audiogon.com/. I know I may sound like I'm advertising it and all, but I'm not.
AudiogoN is an auction site where audiophiles go and sell their used equipment. Anything rated 9/10+ has no imperfections and is in almost the exact same condition as out-of-the-box new. I haven't bought anything from there yet, but I plan to once I get a job.
And before you ask whether you can trust AudiogoN or not, I'm pretty good friends with a local audiophile where I live, and he was the one who recommended the site to me when I asked him for help selecting studio monitors.
Also, just miscellaneous information, but check the tweeter type. Aluminum tweeters give more harsh sound, silk tweeters are more soft and forgiving. So if you want raw horsepower from your speakers, go with aluminum, but if you're going to be going for long periods of listening non-stop, silk would be the best option to go, as it'll be easier on your ears. Just a tip that the guy with over $10,000 worth of audio equipment and years of audio experience told told me.