Micron pens by Sakura, they are the least smudgy from eraser or hand. I use a mechanical pencil for my base lines, nice and precise, cheap and easy to find. Primascolor pencils are the best, most intense, best blending. [link]
I generally use Zebra 0.7mm pens when I draw. Depending upon how lightly you press, the marks rival a hard pencil in terms of darkness. I'll usually use a blue pen for the initial sketch and black later on.
For the final I'll go with some sort of .5mm gel that will make a good permanent mark that's dark enough not to disappear during processing.
But, that's just for me, I do lineart and comics mostly, although, the pens work just fine for more complicated line art as well.
I usually only need something else when I'm wanting to add color. I'm not sure how much they cost, but I think the last time I bought a pair it was like $3 or 4 for a pair.