How serious are you about macro? Maybe this is what you should be asking yourself.
If you're serious, then a good macro lens will be something to think about. So, which lens to get? Well, it depends on what you wanna shoot. What lens would it be if you wan to shoot insects? The reply would be, what kind os insects?
Went out on outings with fellows using a 50mm and Raynox, and some came up with great results. However, there are limitations to using Raynox as you need to go way close to the subject. This is not bee good for insects like butterflies and other skittish insects.
Since you have a Raynox, I would suggest mastering it first. It's not easy at first but practise makes perfect.