I would not use HMB, there's no real proof that it actually works and it is not cost effective,
Here's my suggestion
EAA's
L-Glutamine
Beta Alanine
Citrulline Malate
Arginine (either AAKG or AEE)
Glycerol Monosterate
L-Leucine (yes L-Leucine is in EAA but extra Leucine is advantageous)
Creatine (optional, creatine can be used after workout)