Well... I'm going to give this talk a shot...
A lot of people are liking the capped areas of KS/NE and parts of southern IA. This is because the skies will be clear, instability high, but the cap will also be tough to break. But, if it does like any other severe outbreak, it will break hard! So, current thinking for those liking the southern option should target an area around KS/NE border.. Storms may not break until nightfall there though, so it is a difficult decision.
As for myself, I won't be chasing anyway due to graduation... But, the northern option will include the areas of NE/IA that should see the first initiation of convection in the afternoon as the front begins to move through. Right now, the target area in this area is going to be the Storm Lake or Carroll/Denison areas. These should be on the front at peak hours, making them good choices.
Right now that models are looking a little off on front positioning... GFS is faster at moving the front though, they have it past the nw IA area by 00z, while the NAM has it right on the SD/MN/IA/NE corners by this time. If the NAM verifies it will turn out better for many chasers in the northern option becuase this gives the air plenty of time to destabilize with capes in the 2500 j/kg range. Looking at Carroll skew-t for 00z, shows great shear (EHI at 2.9/SRH nearly 300), cape at 2000 j/kg, cinh is negative, and LCL height is at a great 690 meters...