I collect fountain pens, but I use them all (as much as possible). I have a lot of vintage Mont Blancs (don't care for the new ones) and Parker 51's. That said, my most common daily writers (and the ones I put in my breast pocket safely on plane trips) are newer Auroras or a beautiful old Sheaffer Triumph Lifetime with a green striped barrel - seen below prior to restoration:

Mont Blanc from the 50's that belonged to my father:

A "gaggle" of Parker 51's:

Great modern writers (Cartier and Conway Stewart):

Wonderful and consistent writer for under $100, Aurora Ipsilon:
