According to most reviews, the Superstar EP is underpowered in its stock setup and also suffers from short flight times. The Electristar is a much better setup, but at a considerably higher cost.

The Electristar comes with a brushless outrunner and a LiPo compatible brushless ESC right out of the box. You do not have to upgrade the Electristar ESC to run LiPos, you simply plug them in rather than the basic 3000Mah NiMh packs that will also fly the plane. The NiMh option simply lets you get your Electristar flying without having to spend a fortune on a pair of large LiPo packs.

I've actually seen the Superstar EP fly, and it would be a good little trainer for days when the winds are fairly calm. The Electristar will be better able to handle moderately breezy conditions and will have double the flight time. Whether it's worth spending $450 versus $250 is a personal choice however (Electristar RTF plus 2 NiMH packs and charger vs. Superstar EP 4-channel RTF), and one you'll have to decide on for yourself.

If you're comfortable with brushless power setups, you might take a good look at the new Thunder Tiger Tiger Trainer OBL ARF. It's almost ready to fly and comes with an engine mount that will work with either .40-sized glow or brushless outrunner power setups right from the box. It would let you start with a large stable airframe similar to the Electristar, but install whatever brushless power system you'd like.

Good luck and good shopping.