Common codepages to fill?


And another question to the experts:

I can't seem to stop adding glyphs to every empty cell I see in FL, it's addicting. Nonetheless, I think it's time to stopp adding glyphs and concentrate my energy in other things like spacing, kerning, overall balance of each glyph and so on...

So my question is: Which "average" or common codepages should I completely fill to make my font functional? Currently I have 439 glyphs spanning a lot of codepages (my main goals are to provide basic latin support plus Russian).