For me its the neck on my BFR JP Koa (from 2008). Its just perfect. Although, when I had my Mystic Dream JP with the RW neck, that was amazing! Those necks are un-freaking-real.
i guess ill get slapped for saying an all rosewood bongo 4 neck feels amazing
i somehow seem to enjoy the evh neck too, but my guess is since its been played quite alot so its very comfy..
i also like the al neck. jp6 neck was too thin for me..
20th Silo and Silo Special...but I liked the Luke neck a lot too when I owned one. But right now its definitely the 20th Silo. The shape is a tad chunkier than the Silo Special and i think the Birdseye Maple makes it faster and smoother to play (hahahaha ).