Fretboard. I bought an ash body with see-thru white finish, and it needs a neck. I'd like the darkest rosewood possible to offset the white body, and match the dark tortise shell pickguard. Musikraft makes some nice necks with the neck carve that I like, so I'm looking at purchasing one.
When dealing with luthier supply houses, I have found that asking nicely for exactly what you want goes a long way. The folks at Luthiers Mercantille and Allied Lutherie have gone the extra mile to find me some wood that matched what I was envisioning in my head. If you want the darkest fretboard they can find, ask and see what they can do.
well one other variance to consider when choosing a rosewood board may be the degree of porousness of the board - I have a variety of guitars with different rosewood boards - and some are definately "smoother" in feel than others. That being said, I dont think one could attribute that to any particular species - the smoothest I have is a SG with a BRW board that has few prominent pores on the surface....but that is not consistant across all the ones I have with BRW fingerboards...
I can definitely tell a difference between the ebonies and rosewoods on my guitars. I'll typically use black ebony and cocobolo(Mexican rosewood). I"ve also used macasser ebony(brown striped) and indian rosewood for boards.
The ebony seems to have a bit more refined, if somewhat harsh edge to the tone; the rosewoods are more open, resonant and "raw" sounding....sort of like the difference between an amp with a pretty serious negative feedback loop and one that's just straight through the output transformer....not that one is necessarily better than the other, just a bit different.
I personally prefer the cocobolo for MY guitar designs.
If you want a rosewood look, but without the pores, go for Pau Ferro. It wears well and is as smooth as silk. Cheap too! I've got a 9' Pau Ferro board that's 11" across that should keep me busy for a long while whenever I dive into my guitar-making hobby.