~65k budget = newer M3 vs older M3+roadster?

With a loose budget of 65k USD, would you go with a G80 vs a ~40k F80 + a ~25k roadster (987 Boxster/C6 Corvette/2nd gen Z4)?

I have a 986 currently and do love the roadster experience. But I also have 3 kids and must have a 5 seater. Is it worth the large cost difference to get the G80 instead of F80? Or is that 25k difference better spent on a pure sports car?