The sheer quality of the suggestions so far confirms the fact that AN's products provide rich stacking possibilities to reach the same goal. While I do not want to introduce further complications, I would like to say that whatever choice one finally makes in terms of a bulking stack, IGF-2 and Drive absolutely should belong there, in addition to NeoVar. To my mind, RPM should also be consumed at half-dose, to exploit the synergy with Drive/IGF-2, as well as further enhance quality bulk. Half-dosed RPM has been known to deliver full results when stacked with full-dosed Drive. One reason is because of the well-known synergy between dodder seed (also in IGF-2) and icariin (they potentiate their individual effects), not to mention the further enhancement due to naringin.
Why IGF-2 and Drive?
First, consider what the individual products deliver, then isolate the overlaps:
IGF-2:
Endurance/Strength. Lean Mass. Hypertrophy. cAMP-and-cGMP-boosting. Testosterone Modulation/Sexual performance. Glucocorticoid Antagonism/Cortisol Regulation. Prolactin Inhibition. Glycogen Regulation. Phospho-Creatine Boosting (relevant for a NeoVar synergy). Insulin Modulation. Growth-Hormone Synthesis. Adaptogenic Protection...
Drive:
Elevated Mood. Heightened Endurance/Strength. Pronounced Improvement in Recovery. cAMP-boosting. Significant Improvement in Lean Mass. Anti-catabolism. Noticeable Muscle-Hardening. Elevated Aromatase-Inhibition. Elevated Testosterone Levels/Sexual Performance. Adaptogenic Protection...
To summarize, in my personal opinion, IGF-2 and Drive should be the foundation of a bulking stack. NeoVar should be added. RPM is optional, but preferable at half-dose.