The Esterbrook pens are a great bargain, as are the wartime and post war Waterman, with the military clip.
The English Stainless Parker 45 (Flighter) can still be had in pen, pencil sets and writes nicely with a hooded gold nib.
Don't bother buying any nib that's more than 14k gold, the performance goes down beyond 14k and steel nibs perform about the same as say an 18k gold nib.
Remember you're buying the nib, not the pen, if performance is your goal, not a fashion or status statement.
Sailor pens are beautiful, their nib selection wide and you might want to take a look at their music nibs.
I like Noodles inks too, Heart of Darkness, etc, but there are some nice inks out there to try and you can find inks, partly used, on the Fountain Pen network, as well as pens and some nibs, even papers.
If you want a thin line, try a Shaffer's accounting nib; it also a good drawing nib.
You can remove and replace nibs, sacs, "J" bars without too much difficulty and micro polishing clothes are also used by experienced users to restore bodies.
Beware "crystalized" body resins, they are trashed bodies and only worth the nib.
Cheers