another thing to think about for a perpetual is...where you gettin your next plant?
you can either clone or buy seeds. there are advantages and disadvantages to both.
with cloning, you know what you're getting, and can run multiple mothers if you want, so you can have a little variety.
you have to decide which method you want to use to clone, bubble cloners, aero cloners, rapid rooters.....
if you go with seeds, you have to have a reliable source. there are quite a few decent seedbanks out there, herbies, the vault, seedsman....a lot of others, but you have to cough up the dough, and wait on pins and needles to see if customs let it through, or if you'll get that "bad boy, stop it" letter instead of your beans. that doesn't happen often, but it does occur from time to time.