I am with the IRON alliance. They have a nice nation startup program, very useful for nations about 2 or less weeks old. They have the most nukes of any alliance, but do not use them (against their rules of engagement and war). The alliance has a lot of members, and is very organized with squadrons and commanders.
I haven't fought a war yet, and since I recently lost the ability to make CMs, I will wait before I join in on a conflict.
The good thing about the alliance is they do not attack anyone without good reason, and fight defensively rather than aggressively as I have seen some NPO guys do. They also have a nice loan and foreign aid system.
Not to say that IRON is better, I just like its style.
The only problem I have is with the Admin. Now I need 200,000 dollars for a harbour, level 15 tech+100 infra+4000 dollars or so to buy a cruise missile, and technology costs about 15000 dollars per level!
Its really slowing down the growth of younger nations...
Luckily I bought 5 cruise missiles before the update, so I have 5 strikes available before I run out. I won't be able to build tanks or cms for a while, because I'm saving up for a harbour and don't want to spend money on technology until I get one.
I'm making about 18k a day, so It will take about 13 days. Pretty quick actually. If I get attacked I will be able to get free foreign aid (no loan paybacks), so I'm not worried about interruptions.