Welcome aboard. Don't know that boat but I would be very careful about the engine. The Mercedes MTU is not a well known engine in the US. Bigger ones made by MTU yes, but this one I suspect was a Mercedes block marinized by MTU. Support will be problematic.
I notice that the other 2000 Ricker 42 with a Cummins 6BTA lists for $30,000 more on yachtworld. That tells me that the Georgia boat is probably discounted heavily due to the engine.
Also singles are a little unusual in a 42' trawler. GB made very few single 42s.
None of which would put me off. The $30,000 difference is just about enough to repower with a remanned Cummins if necessary. And with a bow thruster, twins are not really necessary.
David