I feel as though a good amount of people, including myself, get to comfortable with their company they order flavorings from. There isn't anything wrong with this, but I want to branch out to other companies and mix different flavors from different places to make something truly complex. SO I ask you please tell me what flavors are a must from anywhere but TFA.
Decadent Vapours absinthe for sure. Liberty flights sells it if you're in the US.
Flavourart's tobaccos (shade, dark vapure, 7 leaves, etc.) are all good.
I've gotten comfortable with TFA's fruits and haven't used anyone elses with the exception of FA's orange flavor.
Lots of people like Capella's bakery type flavors, I hear they're very good.
+1 for Flavourart's tobaccos. Note that these are strong. Most are recommended on their site at 1 - 2%, and I find that high.
Someone posted these charts of FA tobacco flavours the other day (sorry, can't remember who to credit): http://www.happyvaper.com/Concentrated_Tobacco_flavourings_s/29.htm
Gives a good idea what notes you will find in different ones. I've only started experimenting with them, but I think there's the potential for some good, complex tobacco flavours.
The alcohol based super concentrates from EcigExpress or The Vaping Zone. Their tobaccos are excellent. It's hard to recommend flavors, it's all subjective but it's a good line of strong concentrates. (Cigar/Cherry Cigar are awesome)