With carnage's 3% boost to alacrity, it's super easy to optimize for the 1.3s gcd. Note: Earpieces/Implants provide the same stats as optimized gear, and count towards the enhancements necessary.
248 gear with 236 augments:
Mastery:
2x crystals, 1 augment(personal preference, either use 1 versatile augment, or swap it with a critical augment) (too lazy to add it all up, but it's something around high 6000s, low 7000s)
Accuracy
1 enhancement, 3 augments, 1 stim (765 accuracy)
Alacrity:
3 enhancements, 7 augments (1379 alacrity)
Critical:
6 enhancements, 3 or 4 augments, 1 stim (either 1911 crit or 2009 crit)
248 gear with 228 augments:
Mastery:
2 crystals, optional 1 augment - personal preference
Accuracy:
1 enhancement, 3 augments, 1 stim (759 accuracy)
Alacrity:
6 enhancements (1386 alacrity)
Critical:
3 enhancements, either 10 or 11 augments, 1 stim (either 1884 or 1980 crit)
Pudgies - The Harbinger / Satele Shan