This is a great Towny Survival (with some PvP) server that I've found in the past month. So hear my out while I rant to try and get you to join in on the fun.
This server is probably one of the best run I've ever been a part of. As somebody who has been playing minecraft for years, my biggest problems was servers never last. Well, this one has been up since the middle of last year, and is going strong still. BUT, don't let that turn you away. There's always new players joining, new towns popping up, and new portions of the map being explored. There are ALWAYS people online. It dies down to a just a few in the wee hours of the morning, but during peak hours on Sunday's we get around 35-40 hanging out. They also have a fully function Dynmap, Econmy, Stabbles, and Quickshop plugins just to list a few. However, hands down the best thing about this server is the tournament system they have. Long story short, towns compete in 3 different categories (culture, economy, and military) over the course of each month and then a champion is crowned. There's also a 1v1 PvP tourny hosted each Sunday as well!
For more information on the tournament system, dynmap access, or any information on the server really you can visit their active Enjin forums here http://ionia.enjin.com/home
Hope to see you guys on the server soon!!!!!!!