Geez, I just can't bring myself to paint over the wood. Saying goodbye for good.
I can see it now. My left hand holding the wrist of my right with a paint brush in it, clenching my teeth, telling myself to be strong.......
I suppose what concerns me is if I was to go all wood on the window, it will look out of place with the rest of room with the white base etc.
FWIW.... you'r replacement "wood" window, has a vinyl jamb liner in it now. I can't tell from the pic whether it's white or beige. Most likely it's white. So, the "all wood" look is out the window
so to speak already.
Personally, I love all stained woodwork, windows and doors. But, honestly, I also think warm neutral colored walls with bright white semi-gloss trim moldings and doors looks upscale and sophisticated.
A combination of the two looks nice as well. A nicely stained window with professionally done casing (primed and painted BEFORE being applied around the window so that the lines are ultra crisp and clean between the stain and paint) would definitely draw attention to the window. Almost as if the stained window was a focal point.
So, if you already have painted trim, but want to draw attention to the new windows, then stain the windows and paint the trim. If your existing trim is stained, then I would stain everything.
IMHO, YMMV, just my $0.02 and all that of course.