frets; standard answer is stainless. as far as size, how should i know. i dont know what you like, or even play bass for that matter.
fretboard, you cant go wrong with ebony. for bubinga i'd go bubinga board because it looks cool. i also love the look of bloodwood.
with wenge i'd go with kingwood or ziricote or pau ferro or macassar ebony. probably the ebony to keep it bright and snappy.
i may just stay up today and get back on schedule tonight. if i go to sleep now i'll sleep till it's dark again and that's not fun.