Your boat tends to be in the inbetween width for most people(8.5' or 9'). You are just going to have to try a pair of each before you buy(if that is possible). I personally prefer to have my hands a bit apart, which coincides with the 8.5', but if you like to row with your thumbs almost touching off the end of the oar handles then go with the 9's. Also remember that the 9's will give you a little more power in the stroke because you get a longer pull, but the 8.5' allow you to make more maneuverable quick strokes if you have to do a lot of ferrying. Look forward to seeing your boat. FM