Edit: OK..you have the right bezel, so an aftermarket radio will provide a touchscreen... read below.
Regarding 06 Nav options, Google is your friend...
You want a Touchscreen Nav Radio more like the RA4 in the new WK2 GC. The REC radio with Nav offered in 06 uses a joystick and is NOT a touchscreen and their are no other factory options. My wife's 06 is a Limited also. It has the smaller bezel and REH radio. The bezel offered in the REC (Nav) equipped 06 GC has a larger opening and is required if you want a double din size touchscreen radio. I will swap bezels and install an aftermarket touchscreen radio. That is your only option as well.
For others benefit, the bezel is called a "06 Grand Cherokee Nav bezel" on EBay...$180.
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