Yes, donors will get their rank back, ( they may be modified) but if you donate for server hardware you will receive the highest donator rank. More information can be found on the news modules to your left.
I've had GGServers as a previous host, and we'll they're Support is really bad, and I've been changed panel's about 5-16 times. And well, I mean it doesn't mean you CAN'T use it. Just wanted to give my opinion.
I'm planning on keeping this server on 1.5.2, but getting it more populated by adding some cool things. For example: Quartz Tools and Armor, RPG Items, More Craftable things. If you got any ideas let me know below in the suggestions forums.