There are lots of restrictions in this hobby with any type of tank.
If you like the inverts, I would stay away from an aggresive tank.
I agree with Jrein. I think the aggressive fish are a little heartier, and easier to keep for a first time SW tank. You just have to be careful on what species you add, and in which order you add them.
Either way I would make sure you invest in enough live rock and a deep sand bed to give you the basic tank platform. Then decide after you see what comes on your live rock. You may fall in love with some hitchikers that would get chomped up in an agressive tank.
(you could also do what I did and get both
)