Talking about nuts.

Any advice on what is the best material (and best brand or manufacturer) for a nut at the top of the neck? Thanks in advance.

Bone

I usually use a bone nut if I'm putting together a guitar. Pretty cheap and a definite improvement on the standard plastic nut I think.

glass filled delrin

Bone installed and shaped by someone who really knows what they're doing.

Definitely bone. Koko and MrTwang are spot on, too. A badly-shaped bone nut is probably worse than a well-shaped cheap plastic nut.

Capo the first fret and detune and no nut's a bad nut!

Really... why the heck aren't zero frets more popular?

my order of nut material preference - unbleached bone, horn, corian.

zero nuts can't be readily individual string tweaked for nut relief as can be done with a real slotted nut.

Bone. Only on the nuts at the top of the neck.:lol: