I have the Raymarine Dragonfly 4 Pro at the helm. It's CHIRP, DI and chartplotter and works amazingly well. It has the free Wi-Fish app which is wireless that I hook my phone up to and use it at the bow. I even bought a cheap 7" tablet to keep in the boat. It's like getting 2 finders for one. Shop The GPS Store for best prices. I've bought 2 from them after one got stolen(long story). They offer a 4, 5 and 7 screen size. Even the 7" is only 449.00! But the 4" screen is all you really need in my opinion. Really sharp and bright.
Just my 2 cents.

Paul