RE: Could you suggest a good 400 to 450 electric heli?
I have flown a Trex 450. I just ordered the EFlight 400. It is a RTF with a new 2.4Ghz Spektrum setup. I am not too sure about the gyro, but I have a GY401 if I want to change that out later. You can find it here: [link=http://www.hobbyzone.com/rc-helicopters-e-flite-blade-400-3d-rtf.htm]EFlight 400 3D RFT[/link].
I got into Electric because I am currently in Iraq, and the availability of Gas or Nitro is non-existant.
Hope this helps.