I just ordered a 500 GF combo from Infinity Hobby. Heli, motor, esc and GF blades for $299.99 plus $32 dollars shipping from Taiwan! It's a Christmas special! The 500 was designed with 450 owners in mind as you can use 2 of our 3s1p lipos hooked in series to get a 6 cell power system. ReadyHeli sells a "Y" connector to do this. They might weigh a little more than a 6s lipo but probably have just as much power. I like the fact that I don't have to buy $140 to $180 dollar packs right away to get her in the air. Alan