To me, the best Gaelic font ever, is
Rudhraigheacht.
http://www.folkplanet.com/seanchlo/ruraiocht/ru3.html. (strangely enough they didn't use the true Irish s and r, they used the Roman-like forms instead, while the true Irish ones do exist in that font).
Because it is really like the font you can find in the old printed books and it's quite regular and beautiful.
You can download it here :
http://www.smo.uhi.ac.uk/~oduibhin/mearchlar/fonts.htm (if the links work, maybe you can find it on other websites).