I use Alibre Design Expert. For 2.5D work, you're well set. The machine will allow you to do full 3d machining, where the Alibre Expert's tool paths are not going to help you.
I initially tried with Alibre Design Expert, and soon the work needs outweighed the software, and then the decision came to either get the Alibre CAM, Pro or to go for an independent Visual Mill Pro. I choose the later. I do solid models in Alibre, 3D models in Rhino3D (mind you it will require you to export to Rhino 4, since it doesn't read in 5 WIP), and export the data to Visual Mill Pro. It works well.
Remember one more thing, Alibre Design's data export screws up the units. When I send some of my vendors material designed in Alibre, they always get back to me asking me what are the dimensions of the part. So if you have vendors, you should include a set of dimensioned drawings with the exported 3D.
All the best,