i currently have a HB 597cihd bow mounted with a minkota maxxum 70lb with the variable speed. when I installed the motor (replacing 5-speed) I had a problem with rf interference. to make a long story short, I ended up replacing the brushes and installed the built in us2 transducer. i am now interested in installing something with a larger screen. I would like to stay under $500. I would like gps, color screen, and down imaging would be nice but not essential. My question is what is available at this time in a 7 inch or larger screen that will still work with the us2 transducer?