Well from what I see you need a decent modeler and you are set. From what I know of carrera it is decent as a modeler but that is nto its strenght. It has a very good renderer so if you get a modeler you will be set. Modelign there are a nuber of schools of modelign and they all have to do with how you want to work.

Box modeling which is what I do is where you take a basic shape cut divide tweak  till it becomes a more complex shape. Wing sand Silo are good choices for that.

There is spline modeling which you bascically make outlines and add and subtract. Carrera has some decent tools for spline modeling you can download moment of inspiration for free and try out Rhino if you want to go deeper in that direction.

Patch modeling Hash does that well and you can download soem modelers like S-patch or Hama patch to see if that is for you. (it is not for me)

Poly by poly can be done in a number of programs too silo and Hex can do that.

How I work is I like a simple straightforward modeler so I use Wings I have a number of other modelers but always come back to that. I like to be able to do character stuff so I use Messiah as my rendering app because I can do rigs very fast and it has all the high end rendering options. Messiah does no modeling.

I guess we really need to knwo what kind of work you wan tto be doing. Architectural character mechanical low poly?

The wit of a misplaced ex-patriot.
I cheated on my metaphysics exam by looking into the soul of the person next to me.