Which Story Do I Write?

I imagine most authors stumble into this problem from time to time.  Story ideas are constantly developing inside our heads and some stick more than others.  But what happens when you have two or three really good ones that stick all at the same time?

I'm actually experiencing this at the moment and I think it is why my writing has come to a complete standstill.  I actually can't figure out which story is dominant enough in my head to write.  They're all clamoring for attention, but I can only work on one at a time.  So, instead of choosing and moving on, I'm actually stuck.

Part of me knows that I should just push the other ideas to the back burner and continue working on book two in the Galactic Dynasty series.  But another part of me wants to rebel and head a completely different direction with all new characters and storylines.  I've even gone so far as to make some preliminary notes so that if I do decide to tackle one of the new storylines, I'll have somewhere to begin.

But what I'm wondering is, am I actually procrastinating?  Do I not want to work on book two right now?  Or is there some other reason for this standstill?

I don't believe for one second that I've lost my love for writing.  No, this is more of an issue with me having too many storylines in my head and trying to figure out how to turn the noise down so I can concentrate on just one of them.  It doesn't even truly matter which one as long as I choose one and move on.

Perhaps this standstill is telling me that even though I have these ideas right now, none of them are subconsciously developed enough yet to take precedence.  So, maybe I should just leave them alone for a little while longer, let my subconscious mull them over some more, and while I'm waiting for one to really break through, continue working on book two since I actually do know where that one is going....for the most part!

Have any of you experienced this problem before? 

What did you do to resolve it so that you could move on with your writing?