Nick, I'm not sure if you will notice any real advantage using a digital servo over a good coreless servo such as a 945 or not. I use 5625 and 5645 digital servo's in all of my planes because of the instant response at full power. They are not coreless though and coreless servo's have there own advantages. In a plane of this size, it is probably a wash. As to battery power and size, I never use Ni-Cads in a 3D plane, only NiMh. I always use 6volts in order to get the most out of my servo's but again that is just my preference. I can tell you this though. In my Funtana 90s (I have two) , I have all digital hitec servos, and they are powered by 6 volt batteries. One has a 2700 mah battery, that one can fly all weekend and never go below 6volts if I start with a full charge. The other one has a 1400 mah pack in it and after 5 flights it will read 5.7-5.9 volts, depending on the duration of the flights, type of flying and so on. So it kind of boils down to how much flying you want to do. If, like me, you want to get in 10-15 flights in a weekend, & you don't want to be worrying about having to charge your planes, bigger is better. If you are just gonna fly 3 or 4 flights, then a smaller pack will do ya. Keep in mind too, a 5 cell pack drains faster then a 4 cell pack does so if 4.8 volts will do ya your packs will last longer.

One thing about the showtime, in my mind it is really just a fancy funfly plane. I save the real expensive stuff like 59XX servos for precision planes and stuff like 30% planes. The twisting, snapping, crazy stuff like I do with funfly planes like this one by nature gurantees them a limited lifespan so I tend to equip them accordingly.