Just got home from work about an hour ago. The Divine RPG mod has always been very intensive on resources. I personally wouldn't recommend it, but like others have said, it's your server. I think it has some great potential though from the sound of how things are being put together for the private pack that you mentioned. Also, I'm certain that you already know this, but once you load about 20 ages in Mystcraft, it will crash the world. I attempted to load about 20 ages in a SSP world and it corrupted my entire pack. Same thing happened on my friends server.
If you need any help getting some mods together to add to the mod pack then let me know! I have some great ideas.
If you need any help getting some mods together to add to the mod pack then let me know! I have some great ideas.