I think some of the lack of a response is due to the fact that many of the people here use certain products as staples in their regime, rather than stacks. Most people, myself included, use Grow!, Surge, and ZMA on a regular bases, and then add on one or more other supplements depending upon their goal.
I'll try to outline some "stacks" (some of which I've used, others not as a "stack" but single supps). . .
Mass: Carbolin 19 and Methoxy-7
Cutting: HOT-ROX and Methoxy-7
Testosterone Boosting: Alpha Male (which is really a stack in itself), or RED KAT and M. Both of these can be used for mass or cutting goals, along with the above listed.
Cognitive/Recovery: Spike and Power Drive (Spike prior to workout; Power Drive after to enhance CNS recovery).
Personally, like I said above, I always use Grow!, Surge, and ZMA and add on something that fits with my goals.
Hope this helps a little.