I'm looking at two RT188's, the first being a 2017 with a power pole, asking price is $25,000. The other is an 2018, asking price is not know at the present time, no add on's on this boat. Both boats have aluminum props, no boat straps, basic/low electronics by Lowrance, the 2017 has a Mercury on it & the 2018 has a Yamaha on it, both are 4 stroke motors. How much negotiating room do I have. Thanks - Glenn