"I say this again, I do not care about light weight. I actually prefer heavier glass. I'd rather not waste money on stuff that becomes waste that goes into my toilet. ^-^
"I love the feel and weight of my 70-200 :] "
Youth truly is wasted on the young.
Ignoring that comment, and trying to make some sense of your on hand cash $2500 - wish I had your problems and back and muscles - ( ;-) ) the totality of all the comments you've made, and staying with the Nikon brand for lenses the recommendations for you are fairly simple.
They might not be big ticket - that is you might not like them because they are economical, but they make sense.
If you have the 70-200 (I hope it's the VR), you have the portrait zoom.
I'd add the 10-14mm DX wide (economical and can do double duty as a fish eye with software in RAW post processing and look terrific).
Also, a 35mm and 50mm in 1.8.
Get the 18-105mm kit lens.
As a student, you'll have you hands full just learning that and you're covered from 10-200 with two primes for normal and portraits. You could substitute 85mm for 50mm, I bought both, and I also have a 105mm micro.
Don't be afraid of kit lenses. They're in the kit for a reason. Nikon would be perfectly stupid to put a crappy lens in a kit as if they want the kit to be awful - think about it.
The the kit take good pictures. It's just a little slow. Great in the daylight.
But I think we spent your money wisely.