Trying to attempt this on Fightcraft would be pointless. Donators can spawn items/mobs, godmode, etc. Most of the "God" donators that I've seen there have more money than sense so abuse would be a foregone conclusion.
In any case, I have some stuff there, mostly iron, gold, and a few diamonds. Like a true dorf I dug a hole in the ground and built in it. Though it's only a matter of time before some mini-badmin tp's to me and blows up everything with spawned dynamite.
I picked Fightcraft since it's an example of a server that would work well, not because it IS a server that works well. Boring invincible donators is a bit of a problem, as fun as the rest of it is. Also, my absurd diamond hoard would also boring-ify things somewhat. Ideally, we'd want a server like Fightcraft without those elements.
There are two other Minecraft servers I frequent: One was an incredibly awesome server with an economy module, factions, and had about 20 people on it at a time (WARS OF MINECRAFT) that had raiding opportunities aplenty as well as very clever enemies (they found my hidey-hole at the bottom of a ravine 2000 square blocks away from spawn that was dirted in whenever I left it). Unfortunately, it didn't transition to 1.00 very well; it spent about two weeks saying "DON'T UPGRADE TO 1.0" since its modules were slow to be updated, and then it apparently ceased to exist, which is a damned shame.
The other is run by friends of some of my IRL friends. It's a bit weird; despite being a somewhat private server, it averages out between 2-4 people at any given time (0 during night/school days in North American time, up to 10 on busy days), and is currently survival; the owner (and myself) prefer hardcore survival with raiding, meteors, factions, etc whereas most of the regulars prefer creative. Thus, the map is switched whenever extreme griefing/hacking breaks the map, or when SCIENTific experiments break the map (one of my friends cleverly made a sand-spawner, which broke the game engine and caused the server to cry tears of pain and suicide whenever one approached within 1000 blocks of it). The owner would probably love people there, but the number of people there isn't very big, modules aren't updated often, it has a whitelist (though the owner seems to alternate between having it on and off), and the "regulars" are a bunch of creative suckers.
Frankly, I'm game with whatever else we can come up with.