As an upcoming 3rd year electrical engineering student (at a particularly highly regarded US institution of higher learning, mind you), I think my experience is fairly applicable.
After I graduated high school, I swooped up (well, actually... received as a graduation gift), a spec'd out Sony Z. It was amazing (and still is); but to be honest, it just wasn't as worth it as I thought it'd be. Not that it didn't live up to my expectations - because it did -, I just didn't use it as much as I thought I would.
First and foremost, most (>90%) of my professors didn't (and still don't, as I progress) allow laptops during their lectures. And for those that do, it's only a testament to how distracting laptops truly are. Sure, maybe you
can take notes a lot faster (obviously, who can't type faster than they can write) on a laptop, but it's not nearly as effective on memory retention as hand-written notes (for the large majority of society, at least).
Secondly - and going off of that -, much of the material you come across in engineering courses are damn near impossible to replicate easily, quickly, or efficiently on a laptop. Free body diagrams, mathematical equations, electronic circuits, almost everything you come in contact with is much more easily handled by a pencil and paper, than by your laptop.
Thirdly, half the time you're using a computer, it's not even yours. For instance, I had weekly lab assignments for my programming courses, but those had to actually be done in a lab, on a university computer, in front of teaching assistants. Also, my school has a crap load of computers all across campus with special software and whatnot with hardware specifications that would blow away anyone's laptop (like spec'd out 27in iMacs and Mac Pros, for instance).
So really, the only time you ever use your laptop is when you're taking a pr0n break between diff-eq problem sets
But really though, from my experience, I only ever used my laptop to view lecture slides at home, Google crap I didn't understand, submit online homework, write papers, and do weekly programming assignments (which weren't hardware demanding in the slightest). Other than those things, I'd Facebook, Twitter, watch Hulu/Netflix, and yupp... that was about it. That's my experience, at least.
The point? Just get a laptop you want, because to be honest, it's one of the last things you'll be worrying about at college (first being the gender you're attracted to, second being partying, and third: trying to survive engineering)