W series heads

Talked to engine builder who put my motor together for me (no time to do it myself) and he said get my hands on W5 heads or some other really good aluminum heads. So seeing how I'm (more than likely) not going to find a decent pair of late casting W5 heads, what other really good company makes aluminum heads.
I'm hearing good and bad about Edelbrock heads so makes some better then Edelbrock?
Also are W5 heads (late casting) shaft mounted rocker arms?