Hardest part is getting the warning. If you have an intercom, Make sure it has some kind of audio out.
You could get a unit like
http://www.motorcycleradar.com/radar_screamer.htm to boost the beep so you can hear it over wind noise.
Alternatively you can wait for the new version of the H.A.R.D. system from Legal speeding that gives a visual light in your visor that alerts you to the signal.
As far as detectors go, I like to get Front AND rear detection, A radar detector out the front will not pick up a cop speeding up to catch up to you very well. only a few systems that can do that, But the valentine one is the easiest I would think, and they sell a remote mount screen and audio out units. BUT not waterproof. Then you start getting into the remote mount systems $$$
I will personally get the V1 and mount it out on my Crash bars in a water proof opaque box(theft). so it can see behind me nicely then get a remote mount screen on the fairing but again $$.
Nothing really protects you from Laser or instant on. Check what the cops in your area use.