For cartomizers, use a mix of either 70pg/30vg or 80pg/20vg. For atomizers, just about anything that is lighter in color.
Some of my favorite vendors are:
freedomsmokeusa.com - mango, cantaloupe, lucky leprechaun (tastes like a thin mint cookie without the chocolate)
sweetvapes.com - everything but their coffee's are a little dark but not had problems with clogging
vixen*vapors.com (remove the *) - tiger's blood and many others
elitevaporworks.com - love their pearberry and bubblegum
topshelfvapes.com - love all of theirs except a few but that's because I can't taste strawberry
primevaping - avoid...awesome flavors but clog
vaperite - avoid...awesome flavors but clog
parkesvaping.com - no clogging issues with the juices that I've tried
V4L.com - no clogging issues with bandit berry, banana breeze, and No.7
Some of my favorite vendors are:
freedomsmokeusa.com - mango, cantaloupe, lucky leprechaun (tastes like a thin mint cookie without the chocolate)
sweetvapes.com - everything but their coffee's are a little dark but not had problems with clogging
vixen*vapors.com (remove the *) - tiger's blood and many others
elitevaporworks.com - love their pearberry and bubblegum
topshelfvapes.com - love all of theirs except a few but that's because I can't taste strawberry
primevaping - avoid...awesome flavors but clog
vaperite - avoid...awesome flavors but clog
parkesvaping.com - no clogging issues with the juices that I've tried
V4L.com - no clogging issues with bandit berry, banana breeze, and No.7