Scribble brings up a good point about the autocad. When I was working for Boeing over a co-op, they had those god awful secondary mouses (they look like the underside of old mouses but an enlarged ball joint to spin your solids on different axis). Some mouses I think have side ones for that incorporated into the mouse ergonomics which is nice and certainly my preference when doing a bit of drafting.

For at home use though, I prefer my Logitech (dunno the type, I know it by the Nano Lazer mouse?).
- Feels good in the hand
- USB transmitter is small (doesn't protrude from my laptop so I can keep it in all the time and still have freedom of movement)
- Responds well enough for my CSS gameplay (and I'm always on max 10 sensitivity, so I'm turning like crazy constantly haha)

Honestly just try out a few for feel, and if you don't like em then that's what the 30 day return policies are for

Bout that engineering... I offer my friendly advice from experience:
GET OUT WHILE YOU STILL CAN! (Switched from Arch Engr. to Culinary Science, best decision I made, but then again I love food which isn't for everyone... but not nearly as many all-nighters finishing 12-20pg lab reports/ ridiculous partials derivatives for physics/ finishing 12 views of hand-drafting... in one night... on the kitchen bar top with a 24 case of Monsters chilled in the fridge).

Do what ya love, so long as it pays for your lifestyle