My testing partner Seiken already redid the stat cap testing for melees. He prefers to post his results and methods directly into the official forums. Thread here:
http://forum.square-enix.com/ffxiv/t...l=1#post607045
New stat caps according to his post-1.21 testing are...
PGL/MNK: 348STR/305-310INT
LNC/DRG: 348STR/305-310PIE
MAR/WAR: 348STR/305-310VIT
ARC/BRD: 330PIE/295-300DEX
GLA/PLD was not tested. Tested using Ifrit's weapons.
If you use another weapon with lower base damage, these caps will DECREASE. The base damage alters the caps. These are the caps for weapon skills. He assumed that all WSs would have the same cap after testing 2 WAR WSs and found they had the same cap. Auto-attack stats will cap earlier, but he figured people would only care about the WS caps so he focused on posting that. If you want the auto-attack / light shot caps I can dig up the excel file he gave me.
It is ALWAYS to your advantage to cap the stat before focusing on ATK. Also remember that if STR is your modifier (say on MNK), you get 2-fold benefit for +1STR (1 for the mod and 1 for the fact STR is always 0.67 ATK). After you hit your 348 STR cap, you'll only get the 2:3 ratio bonus.