Anyway, back on topic. Excuse me if this isn't totally on the mark, but I don't have much first hand knowledge of Many of these alliances.
1. Punk in Drublic- Arguably one of the most stable alliances in the world of Grepolis, PiDs solid leadership is made evident by consistent top 3 rank achievement in the world alliance, attack, and defense categories. They are also the only alliance thus far to hold their ground well against another top 12. Final verdict: Swim
2. UN peacekeeping- Comprised of several players that I have encountered in past worlds, this alliance does have a fair amount of legitimate talent within it's ranks. The problem: It's an MRA and the parent alliance is very "generous". Since the majority of these players are in no way original to the alliance that spawned UN peacekeeping, I predict that many of them will eventually take their easy earned 5-6K+ points and gifted cities and break away. Final verdict: Sink
This same critique could be applied to all three off-shoot alliances that are currently in the top twelve.
3. CCCP- And here we have the mother alliance! A blatantly MRA with pockets as apparently as deep as Scrooge McDuck, this gang is still going to be pretty comfortable in the top twelve for a while. I think we may start to see some cracks in the alliance after a while has passed in this world when some of their players begin to lose interest and lapse into inactivity. Final Verdict: I'm still on the fence, but for now, I'll say Float
Aside from these three, I don't particularly see any other that has shown itself to be worthy of mention at this point.