If you're having trouble with the amount of power you are drawing, a bigger battery isn't going to help. It might mask the symptoms a bit, (if you put the bike on a charger between rides) but in the long run, you're going to have to upgrade your alternator to a ZZR alternator, or decrease how much you are drawing from the battery. LEDs can help with that. I run a set of LED driving lights where I used to use halogen lights. 54W total now where I used to have 110W. I've got an LED headlight that I like - 20W on low, 40W on high. (vs. 55/60 on standard H4) Replacing the running/brake/turn lights with LEDs can save some wattage, too, but you'll need to replace your blinker relay as well. And the dash lights can be replaced saving a few more watts.
How much wattage are your spot lights and running lights? (I wouldn't worry about the phone and GPS - those generally don't use enough to be an issue.)
