We will give you 1/2 of the retail value of your D180, which is $1600 or $1700 if you have a bright screen.
A basic 7" SkyView with EMS is $4500. All your EMS senders and harnesses are compatible and plug right in. So you are looking at about $3000 to change to SkyView. The screens are not plug in compatible so you'll need to do a bit of re-wiring, and they are also a touch larger than current D100 products.