It is difficult to make suggestions in general. Each one has personal preferences.
Personally, I tend to favor using a fountain pen with a "flexy" nib and water resistant ink. My preferred one is a Kaweco AL Sport or a Kaweco Liliput with a nib hand-tuned by "nibmeister" Pablo from fpnibs.com. But that s only because I like to always carry (at least) one with me in a pocket so I can pick it out for a quick sketch (for calligraphy I also use various italic nibs).
That is why I say it is personal: YMMV depending on use cases and preferences.
As for inks... I have a large assortment, depends on what I'm after. Koh-i-Noor Document, Rohrer & Klingner iron-gall (Salix and Scabiosa), Noodler's Black or X-Feather, Polar (when cross-country skiing in the Arctic), Eternal (Red Fox, Hunter's Green), funny (like ROme's Burning) and others, even Baystate Blue; Montblanc Permanent and Limited Editions; Parker (love the defunct Penman line), Cross, Sheaffer (vintage brilliant colors), Stipula Calamo (various greys and Saffron), Diamine (I specially like Skull&Roses, Golden Sands and Silver Moon, among others), OS Nitrogen, some of Troublemaker's inks I could get hold of when they were starting; and almost anything that suits my needs or preferences. If I were to settle for one, I wouldn't know, maybe Montblanc Permanent.
Dip pen nibs... I could get a full box of flex calligraphy nibs long ago, with something like a hundred, so it's going to be a long time before I need more. That said, I sometimes indulge in Zebra G nibs to put them on Jinhao fountain pens. For this, the titanium ones tend to last longer. I do also use some normal nibs EMF-modified (google it up) by myself to increase flexibility.
But as you see, I tend to favor mostly fountain pens that I can bring with me as EDC (Every Day Carry) so I can always have one at hand.
On a side line, the Kuretake brush pens are also great. I have a few, (industrially-) urushi lacquered, with sable hairs and metal body that can take fountain pen ink. Sturdy, versatile, great quality. The One Million Years edition were an outstanding buy, it is a pity it was a limited edition.
