Yeah, I have no easy answer to the perspective issue. It is possible to mitigate it to some degree (with various tradeoffs).
Here's what I would consider a good "high-level" view which should have a minimum of perspective issues, and showing off some fantastic terrain (from "Fall from Heaven II"):
http://i173.photobucket.com/albums/w57/Adonran/FFH/DragonBones.png
Here's a sample of various cities, grouped by factions:
http://i173.photobucket.com/albums/w57/Adonran/FFH/Cities.png
And since someone asked about it, here's an idea of what Blight might look like:
http://i173.photobucket.com/albums/w57/Adonran/FFH/Barren.png
You'll note that these are pretty dark images (both literally and thematically). That was the flavor for this particular mod. Other mods are more "light", notably the "Blue Marble" terrain mod.
These are all somewhat isometric, so they're not free of perspective issues. That can be further mitigated by panning further out and looking "straight down".
Wow, having BM maps that look like this would freaking awesome. *salivating*
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"A tale is but half told when only one person tells it." - The Saga of Grettir the Strong
- Current: Kemen (D'hara) - Past: Kerwin (Eston), Kale (Phantaria, Terran, Melodia)