Mouse Guard
If you don't want high power, you can go for the humble Guard Mouse. Mouse Guard takes place in the Territories, where some anthropomorphic mice have set up a Feudal society. Led by their queen, the Mouse Guard are protectors and defenders of civilization. But being a mouse, everything is an epic challenge. A spring rain is an unstoppable torrent. A turtle or snake is a dragon. And if something truly fearsome should enter the territory like a Black Bear or Wolf, you're really in for a treat.
The game has some novel mechanics. All conflicts use the same rules, where the mice form teams and determine their strategy. This works whether you're going on a journey or fighting a snake. There's no magic, no clerics, no monsters. But again, when you're three inches tall, normal animals and nature are downright horrifying.
Geez. the only person to mention Earthdawn is DA, and he just put it in a list. 16 posts in, no less! Am I the only one who remembers this awesome game?
Burning Wheel is pure awesome, but it requires quite a lot of "buy-in" on the part of both the players and the GM. I don't know if I can explain that better without going on for like 400 pages... Personally I think I figured out a lot about what you need to run a successful game of Burning Wheel by running Mouse Guard, but that may not really be necessary, as these where mostly "d'oh!" moments (where I realized something that should have been glaringly obvious and/or is actually explicitly stated in the BW rules...).Or, if you would rather go a more traditional fantasy route there is also the game that spawned Mouse Guard Burning Wheel.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.