The best flavoured stuff ever since I started vaping 9 months ago are:
Ry4, perique black - freedomvape
Caramel, cappuccino gusto, ry4 - liberty flights
Watermelon (red label), cappuccino (titan), virginia gold (titan) - Totally wicked
FreedomVape Online Store - Items - FreedomVape (UK) RY4 is good from here but I can't speak for much of their other flavours. The perique black is ok I guess, maybe worth getting a 5ml of it just to see. It's a love it or hate it thing because it's a very strong flavour. Freedomvape is free postage and do juice pretty cheap so it's worth giving kev a shot. If you like mint the mint and chocolate chip is like those green mint balls you put on ice cream. Very spearmint-ish and ice cream like.
E-Liquid and Electronic Cigarette Shop - Category Listings do the absolute best cappuccino gusto in their xo line. It's a little more pricy but it's exactly like a double shot real espresso coffee that I have yet to find anywhere else. Their caramel is to die for too. I really like to get their ry4 and mix it with their caramel as my at work vape.
I've heard good things about the premium blend on liberty flights but I've not tried it yet. The best thing about liberty flights is the reviews on absolutely everything. Give the reviews for juices a read on each one and you'll get a pretty honest review from actual customers.
I stopped buying from TW because of the prices and that they use PG only which I found out I was allergic to a month down the line so that was awesome, not.
Their watermelon I liked so much I bought the concentrate and mix it myself into VG. It's the only one on the red label line I liked. It's less synthetic and sweet than other watermelon juices. It's tangy and just right on the nail for how watermelon should taste. Best fruit based flavour I've had.
The virginia gold I would buy the concentrate for if they sold it. It tastes exactly like golden virginia *smells* and reminds me of what I smoked for years, but it doesn't emulate the taste of a real rollie. I still like it.
The cappuccino there was godly and I mean wow, perfect cappuccino taste. Until about 3 months later every 10ml bottle I got tasted incredibly stale and flat. I stopped buying from them after that. I would honestly have put up with the mild pg reactions I get just to have that cappuccino. If they sorted out what seems like a restocking/turnover issue I've never had a cappuccino juice that tasted so real.