I'm thinking about getting the GoGroove SmartMini BT Advanced Bluetooth FM Transmitter. I have read the reviews both good and bad and feel that for the price it's a good option. One potential problem I see is that since the Rezound is such a power hog, I wonder if this device will give my phone enough juice? I had an older FM transmitter that had had a 500mah charger and my rezound would slowly lose charge while streaming music instead of charging. The GoGroove has a 600mah charger so i'm wondering if this is enough or will I need a 1000mah (1 amp) charger to get the job done?