With all due respect to Jonny, I totally disagree with his conclusion. From my experience, monitors like the BX5s, Event 5s, and others are absolutely a great fit for many home studios, especially when combined with a small sub. The choice depends on your needs, and while a pro producing commercial recordings will certainly shoot higher, many of us here are perfectly happy with a bit less.
As a pro studio guitarist and home studio hobbyist, I'm producing very acceptable home mixes with such budget monitors. Future Music mag's recent blind shoot-out of monitors, conducted by a group industry pros, came up with the same conclusion, rating the Yamaha 3s (overall winners), BX5s (good accuracy), Event 5s, and Samson 5s very useable budget monitors (depending on your personal tastes and needs). Do some searching for these results and plenty of others, including many posts in this forum, that agree.
Sorry, but I can't comment directly on the DX4s since I've never heard them.
In the end, of course, the choice of monitor is subjective, as are most decisions related to artistic expression.
Happy searching,
J.