I can fully recommend FlavourArt (FA) concentrates. They have them pretty much ALL spot on!
Here's a good article detailing them all with tasting notes etc - http://mamajsflavorshop.com/headinclouds-my-notes-on-flavor-descriptions/
Some of us on here (myself included) have been DIY'ing for a fair while now so if you want any recipe recommendations, give me a shout!
Cheers Gee! I'll have a read through that site before ordering any, I was already looking at the flavour arts stuff anyway