Oblivion. Needless to say, this involves mods

[Dusty Lens]

Earnest suggestions:

1) OOO
2) Midas
3) Open Cities Complete
4) All of the Unique Landscape mods
5) Archaeology Guild

Those are the mods I would most strongly suggest. After that it's largely aesthetics and a few quest mods if you feel like it.

But if you secure those 5 your gameplay experience will be greatly enhanced without worry about it being unbalanced or disrupted. Perfect run through complimentary mods.

Though OOO will disrupt one of the most overpowered classes, namely the absorb health restoration mage. This is a good thing.