Looks like a very nice boat...
It looks like it's fairly well optioned up
-windlass
-bow pads
-color band hull
-5.7 OSXI (yes, freshwater cooled, neutra salt, and ocean drives - duoprop)
-LCD TV
-TRAILER!
-Raymarine GPS
The stuff you really did want:
-Clarion Radio
-Radar arch
-TRAILER!
I guess I would ask:
1) What is wrong with this boat? What is dirty or busted? 39 hours on a 2006 is not always a good thing - it means it's been sitting and thus weathering,molding, and rusting?
2)Such low hours in brackish water - is it bottom painted? Has it just been sitting in the water or was it stored on the trailer when not used?
3)I heard a while back that the Ocean drives had some internal corrosion issues? Is there a recall issued or a way to check and see if there are any internal issues? Also remember that if you do hit something with those ocean drives - it's a full case replacement because it's plastic... it can't be 'bent back' or 'patched & painted'.
4) where you are - heat/ac is a MUST have. just make sure you figure that into the 'price'.
5) What's the deal look like? You can buy new for 60-65k. I would put this boat at 45-50k given current market conditions.
Maybe Brett will sell you his generator????? Although the built in generator for a 278 would be an amazing addition - I just don't think it's a pri 1. On days where you are 'day boating' --- you don't need to bring it along... On days of overnighting -- that's when you bring it. Plus, the portability of a generator is kind of nice to have around the house once in a while.
I say go for it. If it's low hours, great shape, price is right, and you get heat/ac added in -- it's a winner.
You may wish you had a built in generator, but by the time you wish that, you'll also wish you had another 4 feet and twin engines.

I would also make sure you have a GOOD dealer give it a full inspection in the drive systems as well as the other systems -- water, electrical, plumbing, etc.