A bow thruster on a 228 Seafarer? Interesting...
To the OP, I think it's going to be a struggle to find all of the things you're looking for, as the year that they switched from a maximum of 250 to 300 horsepower appears to be in 2011. There are a few of those boats out there for sale from 2011 and newer, but it seems like the majority are from roughly 2008 and prior that I've seen. On top of that, most of them I imagine will have saltwater use to them, as well as be bottom painted on top of that. Though you might be able to find a unicorn somewhere in the midwest or Great Lakes area that hasn't had any saltwater exposure to it. Good luck with your search, it took me just over a year to find my 2004 Grady White 228 Seafarer, as they don't oftentimes come up for sale. Seems as though their owners enjoy hanging on to them and keeping them for quite sometime, especially after GW discontinued them from their lineup.