If you are serious about getting your BCP to fly well the first upgrade you want is a good programmable TX. It's next to impossible to get a really proper swash setup without programming, especially subtrim.

I used a DX7, but any good brand would work. If you get a neg shift brand like Futaba, you can even use your stock RX. The added bonus is that even the midrange radios like the DX7 just feel so much better than the el cheapo TX that comes w/ the Blade.

The next upgrade would have to be the superlandinggears or Superskids. Yes, they add a little weight, but you can slam the bird down from a few feet up w/ no damage.....and they just look cool.

Metal head parts, DD tails, dual tail motors or even belt conversions are cool, but start w/ a better radio.

Plus, if you get hooked and want to move on to a high end heli, you have something that will transfer.