This is a bit more "endgame" than the current topic, but I just saw this image posted on lolReddit and it's a nice layout to help compare iLv.90 gear (basically AF+1/Hero's vs Allagan) so you can prioritize your Mythology purchases.
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At first glance, prioritizing crit > det > speed it looks like BISs are:
head: Melee Circlet
body: Allagan Cuirass of Striking
hands: Allagan Gauntlets of Striking
waist: Allagan Tassets of Striking
legs: Allagan Trousers of Striking
feet: (both are identical, lol)
ears: Allagan Earrings of Striking
neck: Hero's Necklace of Slaying
wrists: Allagan Bracelets of Maiming
ring1: Hero's Ring of Slaying
ring2: Allagan Ring of Maiming
(correct me if that's not right)