Might as well update with my current favorite Stalker 5S build:

STK-5S

6xML
4xLRM5, 5 tons of ammo
Engine: STD 310 for 65 KPH
Heat: 1.32
Armor: 480
Alpha: 50, whatever that's worth with LRM's and ML's LOL

Fast cooldown on the missiles for good firing rate, low heat. 6 ML's are nothing to sneeze at up close.