I tried using solidworks to design architectural terracotta, creating organic features wasn’t easy (cherubs, floral decoration etc). I turned to Blender and found after a little experiment it worked extremely well.
I jotted down a few of the techniques that made the changeover from Solidworks to Blender a little easier. Its all in the Precision Modelling Guide.
Edit:
This was a reply to this post. For some reason djasfo’s post has been moved to news and Discussion? weird!!!
Well, first the disclaimer:
I never worked with… but I know what is, well, more or less!
Second, comparing Blender and that soft is like comparing a wrench tool set, with a refillable mechanical pencil! 
Go Blender!
If you’re only doing these models for illustration, then you should be able to accomplish a lot with blender. However, illustration is likely as far as you’ll be able to take your designs - getting production-ready models and/or drawings out of them will be challenging.
Having said that, I have used SolidWorks and find its depth and sophistication (increasing with every year’s release) very satisfying. So, if you have any notion at all that you might need to actually produce/manufacture your designs, you won’t be disappointed at all by having invested in SW. It has very advanced surfacing capabilities built in (not commonly known) and can produce “organic” models - it just takes quite a bit of digging into the app to get to that level. (there is a bunch of support & tutorials at the company’s website, tho.)
An alternative and more cost-effective solution comes from Alibre. They provide a similar product at much more aggressive pricing structures (starting at about US$200 for the basic package) but may lack sophisticated surfacing. And speaking of that price range, consider looking at MoI 3D. It does NURBS surfacing with finesse (with a nice interface to boot) and probably will be all you’d need. (Note that blender’s NURBS surfacing capabilities are currently at WIP status - but are being worked on!)
For the “professional” choice in Industrial Design, you’ll want to look into Autodesk’s AliasStudio - long considered the standard for that sort of work.
Note that most of the models produced in these apps (including your Archicad) can import into blender for rendering and animation quite nicely.