This is something I can spend hours fretting about...so I know how you feel
. I like to consider how it looks from the back...perhaps that is why it makes it a difficult decision? Using the same colour as the hearts would look fantastic...but I guess it depends on the look you are after. Sorry I am not much use here....but will be following the thread with interest.
By the way....it's a beauty. It's going to look fantastic quilted. Please keep us posted on what you decide.