Ran is the cheaper of the 3 servers. You can be decent with a vit class (or a human dual wielding) and glacial gear forged with the new shiny option stones (give minimum dd of 45 and max dd of 58). You can play anything but vit classes have the highest rate of survival for obvious reasons. The new server isen is focused on crafting which will always be more expensive than ran is overall (in the current system you need to reinforce 10-11 items to +12 to get the next tier of gear and there is one tier above that). The success rate at this time is really low and we have no indication from them that the rate will be changed so overall I would put isen on hold until they fix everything up.