While I do like the idea of a modded server, that'd have to be a whole separate topic to discuss. This is primarily about the new map. I myself don't have a good client for mods so I'd need some input to get that up and running.
On to what Punkypal has said, I do believe they said Amplified is most likely off the table. While it'd also be nice to see, I have to imagine it wouldn't be too great for a majority of the players that come onto the server. Wouldn't wanna disclude anyone from the 1.9 gameplay on the server. <object class="emojione" data="
https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/1f914.svg?0" type="image/svg+xml" standby=":idea:">:idea:</object> However, it wouldn't hurt to look into some locations having an amplified-esque feel to them. Along with the ideas of the caves or the arches and other natural formations... Those kinds of things do work best in amplified worlds. If it were possible to add in some select biome types which would show up rarely or as small regions, we could do interesting formations in those locations. Also, in the nature of having said amplified biomes, it'd also help with some people that would want to be in a more secluded location, keeping those derned kids off your lawn.
Give a little to everyone, but not doing every favor for everyone.