I think a Pilot Custom 74 hits all the points you desire. Even if you order from Richard Binder who will tune the pen first before shipping it out to you (you could probably ask for it to be less wet), you're still under $170. And if you don't mind maybe doing some nib work yourself you can get the pen for under $100. I got mine in a medium nib and while tines were aligned and it wrote very smooth, tines were a bit too close and lead to some hard starts under very light pressure. Plus the nibs are quite springy giving you a cushioned feel when you're writing with them and the fine nibs are quite a good size.
As for the cons of the other pens you're considering:
- the EF nib has quite a small sweet spot but if you can hit it consistently then it's a wonderful writer
- during the warmer seasons if I have the pen in my pants pocket my pen will burp ink from the breather hole (I suggest you keep the pen in pocket when not in use to avoid someone taking it)
- very wet writer but the nib isn't what I would consider springy (at least the EF nib)
I don't own one but I've handled one and while the clip placement was okay for me, I wouldn't want to write with it for an extended period of time. And while the clickie would be nice for quick notes, most often than not when I was in school I was either taking notes for an extended period of time or not taking notes at all. I didn't really need to jot down quicks notes that often but that may have been because of the classes I took.
- nibs are mostly very wet and springy
- pen length is okay when posted (at least for my hand size) but it's a narrower pen and I wouldn't want to write for an extended period of time with it
Don't forget that most schools don't use great paper and anyone that has ever had to write in a blue book will know how bad the paper can get. I used a Lamy Safari with a fine nib through my years of college and when writing in blue books it wrote like a broad nib because of the spread and feathered quite a bit, even with a dry ink like Pelikan Black. Fortunately the ruling in those test books is quite wide so I compensated by forming extra large letters.
If you can deal with the size of the M200 then I would say go for that purely because the nibs are easy to swap out and relatively inexpensive. You can always buy another tuned nib from Binder while you can't get loose nibs for the 74 and the VP nib units are much more expensive. And with Lamy nib changes are even more expensive unless it's a warranty change.
Also just because the Pelikan and Pilot pens are plastic, don't let that fool you. The plastic is very durable and if you use the pen for it's intended purpose and not throw it around the room, you will find that you won't have any problems with them breaking. If anything for my a lighter, plastic pen is more comfortable to write with for long periods of time than a heavier, metal pen.