Would agree that NADA isn't necessarily the best way to judge value, but would note that unless you're paying cash it's likley what your bank or credit union is going to use to place a value on it--mine did. Also important to note that NADA does not typically factor in trailer value. Price seems high to me unless it's immaculate and in perfect condition. Something I'd find hard to believe on 7 year old lake front lift boat. Would +1 the 3rd party mechanic inspection. A firm requirement in my opinion if you can't water test it.
2003 X-2 MCX