I have a 2004 Glastron SX 175 with a 3.0L Volvo Penta SX sterndrive. The current prop is a 14.5 x 19 (4600rpm = 38mph). I want to change my prop to a 14.25 x 21 to gain more top end speed. With so many brands to choose from, which should I go with? I want to keep it aluminum and less than $150...