JD, The Furuno 1650 only comes in color and is in the ballpark of the color Garmin 188 price wise, the 188c with a transom mount x-ducer runs $1254, the 1650 has different versions which range in price from $1250 upto around $1500. The Garmin 188 (grayscale) runs $999. As for the question on DGPS vs. WAAS, they are both more accurate then basic gps but with DGPS you have to buy a seperate differential beacon ($20-$25) where as WAAS is built into the unit. The Garmin comes with WAAS built in, the Furuno gives you the option of WAAS or DGPS.