It's a standard H4, so there are tons of options.
Just keep in mind if you go with a bulb with more than ~10 watts above stock, you'll need a relay as the stock wiring isn't up to the task.
In fact, just installing a relay on the stock bulb will give you more light since the bulb will get more voltage.
Since I don't have a 1G Bandit, I'll leave bulb recommendations to those who have experience in that area.