Don't have either, BUT for notes at school stick with what you have. You really want to see a $150+ pen get danaged, lost or stolen at school?
If you want to get one go for it. I just wouldn't take it to school.
Biggest reason: if you are happy with what you have, do not spend money on something else. Wait until you need it.
In general, I like the Lamy 2000, but I like a generous medium nib. My favorite work-a-day note-taking pen is the Parker 51, especially an "English" medium or a wet US medium. (Parker 51's from Newhaven, UK, were marked "Made in England" until I-don't-know-when).
Also, in general, Japanese pens run a shade narrower than European / American pens. A Sailor 1911M or ProGear will have a stiff nib; the medium is about halfway between a European fine and a medium...and the Japanese "fine" is finer. The Falcon and the Vanishing Point have wider nibs than typical Japanese pens, though.
As mentioned above, if you can get to a physical pen store, try out the pens. Above $50 or so, the pen will cost enough that you won't want to buy something just because others -- us, well-meaning though we are -- say we like it.
Aha...almost forgot the classic answer: Buy one pen and three nibs...it's like buying three different pens!
Esterbrook made pens that accept all of their "renew-points": just unscrew the old nib and screw in the new one. A restored Esterbrook will cost about the same as a Safari or a TWSBI. Check Brian and Lisa Anderson's website for Estie nibs. (The great company closed in the late 1960s, but the pens seem likely to last a long long time)
Levenger's True-writer is like a modern Esterbrook, although Levenger seems to have no market for anything other than fine / medium / broad nibs. There is no law, of course, against having a nib specialist make a medium into an exra-fine nib.
Pelikan nibs are almost as interchangeable as Levenger, with slightly more off-the-shelf variety. The "low-priced" Pelikan 200 is a little more expensive than an Estie or a new True-writer, but their steel nibs are about $25. (Unnecessary warning: if you swap a Pelikan nib from a larger Pel into a smaller "bird", you risk having the cap bind against the nib. You can go up, but not down: a Pelikan 200 / 400 nib will fit a $350 Pelikan 600, but don't put a Pel 600 nib into a Pelikan 400 or 200 pen-body)