AG-AC8 vs HXR-MC2500 vs AG-HMC80

I am looking to buy a new Video Camera and would like some advice.
I am hoping to stay under $2000.00
Mostly shooting Weddings and Sports (Thats why I have been looking at shoulder mount.)
Because of sports if I buy a handheld I will need a shoulder rig.

Has anyone had positive/Negative experiences with the mentioned Cameras?

I am also considering a XA20or a Sony PXW-X70. Would it be worth the extra money for one of these?