[Jared]

For general CAD work, CPU clock speed is more important that # of cores.
Make sure your graphics work with inventor/solidworks. The newer intel integrated graphics seem to work alright, but if possible you could try to grab a used thinkpad with an actual graphics card in it.

With CAD, you'll open files faster with a higher clock speed, be able to open more stuff with more RAM, and zooming/rotating will be smoother with a better graphics card.

All the options you have there should be great with labview.