First would be the garmin striker 4 gps/fishfinder.Replaced my old lowrance 500 dollar piece of junk.The little garmin does everything I need or want.Backtrack,gps speed,chartplotting ,etc and of course etc, all for 119 u.s.d.
Mine would be the new prop, so much nicer ride compared to my severely damaged old one that came with the boat that I used exactly twice. A close second would be the fish finder with depth finder in it. Wish I had gotten one with a gps in it.