I'm going to get a Passport 8500, if for no other reasons that I
1. Can't justify spending $100+ for front and rear detection with directional arrows when I 90% of the time, the radar is going to be coming at you from the front.
2. I have to order the V1 and wait for it to arrive but I can go down to Des Moines and buy an 8500 right now.
But, I have purchased another useful "toy", a Uniden Beartracker BCT7 scanner. On my trip to and from Chicago, except for some spots in Illinois, I consistantly got wind of police presence way before I was ever in radar range, avoiding a few speedtraps.
As long as the HP have "mobile extenders", which according to
this little article , 2/3rds of state police cruisers have, the BearTracker gave a warning that there is a HP within 3 miles of you whenever the dispatcher sends a message or keys the mic. It gives no direction or location of where the officer is at, but at the very least, you'll know that there is something in the area and to be on the lookout.
Unfortunately they're illegal in some states, but according to
this website Iowa, and apparently Illinois, are not among them.