[mrguyorama]

Number one is literally the Mount and Blade series. Go buy "Warband" on sale for a couple bucks and play through that sandbox and then start adding whatever mods you want

[mywittyname]

Seconding this. The late-game diplomacy is pretty weak. But the combat/warcraft components are top-notch.

[alas_141]

Checked it out just now and pulled to trigger on it. Definitely what I was looking for in regard to the first.