What would be your choice: Altair Hyperworks, Siemens NX8 or PTC CREO 2.0, if you work area were 3D modelling, Multibody Dynamics Simulation, high quality meshing and linear/nonlinear FEA?
I'd say NX8.5 (and NX Nastran 8.5), it's been released for a couple months now... It's definitely a stronger offering than the other two, but it will be pricey :-)
I recommend Altair Hyperworks. The non-linear capability in NX8 or 8.5 is very limited and the meshing(FE modeling) on Hyperworks is far better than any of those two software.