It seems a concensus among driving enthusiasts that the Valentine One is the premier radar detector. I have purchased this along with the additional display. The unit sells for $399 and $39 for the display. Shipping brings it to $445.
Click here to see where the bolts are to remove the knee bolster piece below the steering wheel.
Here are some pics:
A1: All included parts
B1: Main unit and remote display
C1: 4 bolts and you have access to needed wiring
E1: Yellow label above bolt for ACC Power (below "53") - this is where to connect red wire of the power interface
A2: Crumple zone
B2: Brake shaft/switches & electronic throttle
C2: Pull this piece forward to route wire for remote display
D2: Power Interface mounted with supplied velcro