"There is no ideal place from which a spacecraft can be launched to the Moon, I think.
The Moon is 5 degrees inclined from the ecliptic, which means sometimes above it, sometimes below it. The earth's axis is not perpendicular to the ecliptic but 23.50 from it.
Sometimes (23+5 degrees), the KSC (28 degrees) is indeed the best location. But it can also be 23-5= 18 degrees. "

Assuming this premise, there is a ideal place: the Equator. You can launch from equator higher inclination [18-28 degrees]. From KSC you can't launch lower than 28 degrees. The most efficent inclination from equator is 0, but it would be as efficent to launch from Equator to a 28 degree inclination as it would be to launch from KSC to a 28 inclination.

"But for LEO, it's the equator the best place.
I've wondered : even if the final destination is somewhere near the ecliptic, can't the 0 degree launch basis be the best?
True, there would be an important course correction while doing Trans-Planetary insertion. OTOH, launching from the best location (say 23 degrees for the ecliptic) isn't the best one for LEO, so there is gain and loss but maybe one solution looses more than it gains, I don't know."

I would need to look it up, but I would guess that Smart-1 was launched from a 07 inclination- of course, it didn't take a direct trajectory to Moon. There was a planned small budget probe that was going to get to the Moon as secondary payload on the Ariane 5 booster. I believe they were going to start from GTO, use like .5 delta-v to get to lunar trajectory, and impact at lunar pole at around 2.5 delta-v. This would indicate to me that it's possible to go to the Moon starting from a 0 inclination, and it would be more efficent than launching from a 28 inclination.
I can't remember it's name, but I'll try to search for it.
Oh, that wasn't hard:
http://academy.gsfc.nasa.gov/1998/html/project.html
Easy Low-Cost Lunar Explorer (ELLE):
"The Ariane orbit is a geostationary transfer orbit with a height at perigee of 200 km. The calculations show that the delta V required from the perigee of the Ariane 4 orbit to reach the moon is 585 m/s. Two orbit control maneuvers of about 60 m/s each are planned. The plane changes are performed near the moon when gravitational penalties are small. The estimated speed at impact without any braking is 2500 m/s."