I'll be arriving ORD at 4:35 PM this coming Thursday, headed toward my brother-in-law's in Wilmette.

I'll have just my carry-on, so barring any delays I'll be good to go by, say, 4:45, but I can't think of the best way to get there. My wife will already have a rental car but I don't want to make her make the round trip in rush hour traffic when she could see her family.

That leaves a cab (potentially expensive - anyone know how much? - and almost certainly will mean sitting in traffic), a shuttle (cheaper, but who knows if I'll be first off or last off, and still means traffic, or Metra (cheapest, but I have to go all the way into Chicago to switch trains - in the end, I may not save any time).

Chicago experts - what do you suggest? Would that train ride take more than 90 minutes with the switch? Should I suck up the cab fare?

Thanks!