prodigy is being completly upgraded for euro fw champs,and hopefully it will show alot of improvment, can anyone help with some questions.

1. buying 2 pro peak constellation chargers, i want a power supply unit capable of using with 2 of these at once, is their any cheaper alternatives than the white box one i see everyone has
2. accidently found a spektrum dx6 at my local model shop in stock!!, but they only have a ar reciever, is the only difference with this to the br is it doesnt have built in failsafes? as i have failsafes in my speedos already anyhow.
3. and finally, using these chargers to charge nimhs, should i charge it on trickle charge and discharge it using the charger loads of times, and keep doing this over and over to get these batteries upto top performance, once this is done am i ok to fast charge them after this for events, they are 7.2v 3700mah.

thanks for any help people.