I'll also stick with the under $100 price range.
I'm in college now and I think the TWSBI Eco (or any clear demonstrator they make) is an ideal choice that offers outstanding features at a bargain price.
The price is such that if you lose the pen or someone "borrows" it forever, then it's not a huge deal to replace it.
It has a reasonably good nib with good flow.
It can be taken apart to make maintenance easier.
In my experience it's more reliable than the Lamy, with fewer known issues (nib creep only one of them).
TWSBI's customer service is outstanding.
It's a demonstrator so you can keep track of your ink level at one glance rather than taking the pen apart to check or trying to look through a murky small window. That's a huge time saver for busy college students.
It's a piston filler, so it holds a ton of ink--again that saves time for college students who use a lot of ink every single day.
Some other pens that are perfectly good pens for $100 or less:
* Aurora Ipsilon. A beautiful introduction to the famed Aurora line.
* Faber Castell Loom. If you like chunky pens, this is the FP for you.
* Levenger True Writer. Great pen at its price point.
* Parker Sonnet. Some models are under $100, but be careful here. The nibs have a notorious tendency towards baby bottom. If you can get one that isn't ground within an inch of its life, it's a terrific pen.
* Pilot Prera Iro Ai. A workhorse of a pen at a great price. Get a fine nib, load it up with Namiki Blue ink and be amazed at how well this pen writes on even junk American paper.
* Platinum 3776 Century is readily available now for under $100 online. One of my very favorite pens. I love everything about it--and I mean everything. I have a fine nib, but I'm considering getting an ultra-extra-fine, just to see if it will pass my nasty Mead paper test. No FP has done that, thus far, but I have a feeling that this particular nib will.
* Sheaffer Prelude. I don't like that it's made in China; however, I have a fondness for Sheaffer from when I was a girl in the 70s and it was the only affordable fountain pen I could find anywhere. They were the last to give up on the student market. I like them for that, and I still like how most of their pens write.
* Waterman Expert. It can be tough to find one for $100 these days, but it's too good a pen not to keep an eye out for bargains or sales. Keep looking. It's worth the investment of time and energy.
* Waterman Hemisphere. Cheaper than the Expert, so more accessible for most college students. The barrel may be on the too thin side for some people, but it's a much nicer entry level Waterman than the Kultur. This is where you can get a good idea of why this particular brand has such an outstanding reputation. Well worth the extra expense.
Now all that being said, my everyday writer is a Pilot Custom Heritage 92 inked up with Asa Gao. I normally don't recommend a pen like that as a college student's everyday writer because it's expensive enough to make that not a good idea; however, I'm at an age where I'm vigilant about keeping track of my pens. I don't leave them lying around if I must walk away from my desk, and I'm careful with handling and maintaining them, too. I don't let other people borrow my FPs at all. I keep some nasty ballpoint pens on me to pass out to people who can't be responsible enough to bring a working pen to class. If they absolutely want to try an FP, I have a Dollar pen tucked into my Midori Traveler, and I won't lose any sleep over not getting that back.
I always have a variety of FPs in my backpack, a few of them in the $100++++ category. Mostly I use them for color coding agendas, or simply as a change of pace from Asa Gao. I keep them in a dedicated case that I'm never more than about a foot from at any given time, and the case is never out of sight or in my hand, purse or backpack. I had a pencil case stolen during my second semester of school, and the loss still stings, because I had my first favorite FP in there (a Pilot Prera Iro-Ai that wrote spectacularly well), along with several quite expensive Japanese import school supplies that were not cheap to replace. Ever since then, I've been downright paranoid about keeping track of all of my school supplies.