SPY-3/4 was going to replace a lot of the radars on the Zumwalts and the CG(N)Xs. When CG(N)X fell through the AMDR got picked as the radar for the Flight 3 Burkes.
For SPY-3/4* you'll still want navigation and weather radars, and a few other odds and ends, but IIRC it should functionally take the place of the SPY-1s, SPQ-9s, SPS-49s and SPG-62s on the Ticos (not literally on the Ticos, but those rolls on a ship that replaces the Ticos).
*SPY-3 is the Multi-function Radar while SPY-4 is the Volume search radar
I myself would add something like the CEAFAR/MWVR (found in the USN parts thread) as a backup to the SPY-3/4 combo for things like navigation, weather, and surface search. I'd also use this sheet as a guide for small phased array antennas: