I have a higher end hp that has enough processor and graphics to run solid works and bend tech or solid works and autocad simultaneously. I take to to the shop often but keep it away from grinding dust.
If I need to run bend tech with dirty fingers, I put a piece of plastic food wrap over the keyboard, just like restaurants do.
I got a deal from office Depot on it late June early July as it was a previous year model, and they were cleaning house for the new models.
I had to get a model with upgraded entertainment package to get the better graphics card.
I also have a separate cheap flat screen monitor I can hook up and run two screens at once.
It is working great, but I have to transport back and forth from the shop to my house.
Fwiw, it has i7 processor and was less than $500 on sale. Sticker price was $930ish.
I couldn't afford a tough book.
I've had this one since summer 2011.
Before this one I had an entry level hp that held up pretty well, just didn't have the processor to run multiple cad programs.
Before that I had a Toshiba laptop from 03 - 07. It worked great but the hinge for the screen failed early.
I tried a Toshiba for a week before I bought my current hp, and it blue screened several times after installing my cad programs and printer software.
Somewhat related, may want to check out onshape cad software. Similar to SW, but you run it though Internet connection, so it requires less hardware to run than SW, or 3D autocad or inventor.
I'd say buy the best processor and graphics you can afford. Bigger screen, bigger keyboard, and number pad help me greatly
I am very far from a computer expert..... there are tons more people on here that know wayyy more than me about the topic.