I've got the sames.
For the high power you need to provide an external 3.3V (because these modules are not 5V compatible), for the reason it's drain more power (mA) than an arduino can provide, you can use an LM340-333 or 7803 regulator.
Don't forget that if you want to go 'far' you need to adapt the power transmiter with the
radio.setPALevel( Power_Const );
where Power_Const can be either one of : RF24_PA_MIN,RF24_PA_LOW, RF24_PA_HIGH, RF24_PA_MAX
according to the RF24.h file in the library.
As I said, I got up to 80 meters without any trouble with a rate of 250kbps.
If I can help you more, don't hesitate.
Best Regards.