Good questions are always welcome here!
I'm a Certified Lousy Pilot (and I have the certificate to prove it), but just means my skills are way off, and I'm too cheap to buy the stuff I need to make it all easier.
First, you know you'll need a good transmitter. The Spektrum series and 2.4ghz DSM2 is a favorite here. That puts you either into a Spektrum DX6i or DX7. The DX7 is the full power, full featured 'Big Brother' of the DX6i. The 6i is listed as a park flyer transmitter, but you seldom fly helicopter at a distance beyond where you can identify the orientation. And you never do that twice!
So the B400 gets you a DX6i. The B400 is certainly a good trainer. The B400 is certainly 3D worthy, but the servos don't hold up. They are a required upgrade. And probably the gyro is also a required upgrade for 3D.
You can buy a DX6i and get a Mini Titan and have a really good helicopter. I've heard really good stuff about the Copter X line.
In all honesty, I'd suggest jumping onto the "Struggling with Single Rotor Basics" thread. There are lots of forums specific to brands and models of helicopters, but on the Struggling thread, we fly absolutely everything imaginable. And if we have a need that no one fulfills, we invent it. There are a good many hand built Frankenhelis that fly just fine. It's a great thread with a dozen or so really knowledgeable guys.

Just drop by and post the question that you posted on this thread.
And wait for the answers.

good luck and have fun!
Soloboss