following this with interest. been in similar situations in my business career loads of times.
my tuppence worth is.............
no point telling them to f*** off - you never know when you might cross paths with some of these guys again on a gig you really really want. dont walk away on bad terms - no matter how stupid you think they are being.......
but push them to a decision - tell em you have another offer, and you are being pressured for a decision on that one, but you would rather work with them - suggest you all sleep on it, and have a quick yes/no conversation tomorrow. if either side is still unsure , then thats a "no", wish them well and all move on.
good luck whatever happens!
cheers
L