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The good thing with computers is that you can generally upgrade them as you need. CAD isn't that intensive of a program, but would certainly benefit from a decent amount of RAM and a 3.5+ GHz processor. What you would want to look at first would be the CPU, and, in my opinion, I'm a fan of Intel.

I kinda swear by my Intel 1155 2770-K. It's unlocked, so you can overclock it at a later date if you need to.

 

Depending on how much money you're willing to part with, you can get a relatively basic set up now, and upgrade to better parts as you go.