I'm going to tell you about West Raids as I dont have experience with the other raids so I know this only answers part of your question but it doesnt hurt to include it. I'm a mage, druid 570 right now and I still enjoy hunting there. I started to hunt there around 350 but you need to be careful stick to the walls so that way you dont get surrounded. You can use earth set or protection or a mix of the two. Critical inbument on the rod will make it easier for you to kill things faster. I enjoy spawning my grovebeast there. Big tip is if your not familiar with the spawn spawn your level 200 monster to help you out. Dont go so deep inside the raid when it happens as you can find yourself overwhelmed. I hope you enjoy. Also please use ultimates here great mamas manas won't do it and use avalanche.