I experimented with Amphetamine and weed. Amphetamine is good as a "stimulant" from time to time, but after two days, you better stop using it.
Weed though (depending on the strain) is ideal for "blocking out outside influence".
Doesn't make your beats better or worse. Works with most individuals, completely messes up the workflow of others.
You decide. Definitely try the "active and trance like" effects vs. the "body high" of Indica strains.
Hmmmmm, what can I recommend. Try out Nuken, Green Crack (Snoop Dogg loves it for that "creativity") and Blue Cheese.