i started out with a blade cx2. got ok with it and bought a dragonfly 60.and i have had nothing but problems with it.so i think it was a bad choice hoping someone here can recommend a good RTF heli for a beginner.that wont cost to much.$300-400 BRUSHLESS thank you. in avance

RTF ... no such thing.

Maybe if you describe the "problems" you are having ... someone here might have an answer for you.
Do you really want to spend more money only to find out that it's your set up that's causing the problems?

a used lite machines corona would be your best bet

It is not CP but is super durable

The No. 60 is difficult to fly than the Blade CX, but if you spend sometime to learn and pickup the flying skill. You should be ok. What battery and motor you used? Lipo battery & brushless motor will make the No. 60 very stable with some trimming (the factory setup job is bad, so do some trimming by yourself will be very helpful. Try to get help from someone in the local flying club)

Pictures of the No. 60 setup

You can spend money on upgrades on the 60 to get a halfway decent flyer.
If you could get closer to the $500 range you could get an entry level T-Rex in the air. Of course that would be a kit you would have to assemble.
RTF under $400? I have heard good things about the Falcon 3D but have no first hand knowledge.
If you are carefull and shop around you can probably get a pretty good used heli in that price range but I recommend you have someone with experience check it out before buying.

Setup, like Tippy says, is critical for new pilots. Many RTF helicopters are not setup right and as such are very difficult for new pilots to operate. Run a search on this topic and be sure to check out the Walkera forum here at RCU. My Blade CP was much easier to fly once I got the setup dialed in and I would have, most likely, destroyed it had I not worked on correcting this. Skilled pilots, on the other hand, can often overcome setup errors due to their experience.
Rumor has it that the Axe CP (~$200, brushed) is pretty good for an out of the box RTF heli, so look in to this if worse comes to worse. This is just my .02 worth.

Good luck and good flying!

P.S. "RTF" means "Ready To Fix" for most models when it comes to setup.