There has been a bit on the site about this recently. Generally the Go, the Jabsco Golight, and Guests are the ones used. You can spend anywhere form about $100 to well over $1000. Just consider how much you will use a search light, and how even a few seconds use will damage your light vision for a number of minutes.
The Jabsco 135 SL remote control is in the mid $100's and one I have used on a couple of boats. But on the C Dories I have owned, only potable lights.