Traffic conditions really do dictate how you should be running your front light. During the day, flash is really the way to go. Dusk, dawn or night, depending on where you are, flash may or may not be the best mode for you. On rural dark roads, solid is beter. In a well lit city, flash seems to be more visible.

OP - you mention being cheap when it comes to non essentials. Since when are lights and your safety a non essential? Spending the extra bucks for a highly visible light is absolutely worth it. As for an all in one controlled unit for front and back, not sure that this exists.