I have always gone with 9.25k sp/1.85k HC/50 scouts per village (with additional rams/cats, yes both even in 15 tech worlds) as a D build, if in a archer world (which i admit, can't remember last time i played in seriously, i think it was w7 in .net so it may be 'outdated') i replace 3.75k sp with 3.75k archer.
As for O, meh the standard nukes 6.5k axe and 3.25k LC going more axe heavy over time (up to 7.5k axe and 3k LC) with 250 rams. In MA worlds 2 different sets of MA builds (one with 3k LC and 200 MA, axes at 6.5k, the other with 2.5k LC 0.5k MA and 7k axe).
This obviously varies A LOT depending on the situations, settings and even on the location on the map.
As for O villages to D villages ratio i have always gone to the extreme with D usually having 1 to 4 (O to D, the 1 O being the start up village) at 5 vills, and 4:6 (O
) at 10 vills. Later on always trying to have 1.5 D vills per 1 O village.
This obviously depends on your playing style a lot, but it gives a certain 'security' feeling you don't have with pure O or near it.
It also in no way slows down your growth since sp/HC farms BETTER than LC for a averagely active player once you reach 5-6 D villages (ie 10 vills in total). In fact, since D (lets be honest, how often you get attacked early game) is less damaged (you get the point) D villages are awesome for bookmarked farm runs (they rarely get killed in an amount that screws up your saved farm runs unlike nukes) and are my main coin/package producers (sp's lower cost and HC's long build time) even when i only have a 1/3rd of the village fully trained.
So umm, unless you are a total idiot (sorry) who hits every turtle he sees and thus needs large amount of O to grow efficiently overdoing a bit with D is nothing to be ashamed off.
So yeah, use the 2:3 O
ratio.
As for the troop builds, simulate few variations for a while you'll get a 'combo' you like.
I know i'll get flamed for this since overdoing with O seems to be cool and stuff, but this is my way and it has yet to fail me.