I've been lurking here for quite a while, and decided to actually register in order to weigh in on this..
I would also recommend the nhaler lung juice sampler pack as I found it to be more than adequate to find and fixate on the flavors I like. Yes, I now have more than I need of the ones I don't care for, but it was worth it to me.
Let me say right at the outset that I don't completely understand PG and VG mixes and the amounts of vapor they produce, but I had been a bit disappointed with vapor production of some personal favorite flavors (555,RY4,etc) from more than one other vendor as delivered by my KR808D-1, and had considered moving to a 501. Who knows, maybe I still will, but what I'm getting to is that I was very impressed by the vapor production of the entire line of lung juices. Green Tea Lung (this 'Lung' convention is a small marketing mistake, imo) is excellent and produces voluminous amounts of vapor.
But (again,imo, but check around here because I am not alone) Pear Lung is the absolute best in this line and will be the one I cannot be without. I tested some on non-vapers and they described it as at first tasting like nothing, and then all of a sudden "oh, I just ate a pear". To me, it's a very 'authentic' pear taste.
I will quickly dismiss the others:
Orange Lung = Chewable Vitamin C
Pomegranate Lung = Childrens' aspirin
Watermelon Lung = watermelon Jolly Rancher
Obviously, your experience may differ (or you may actually like the taste of the things I've described). Many may find the 12mg/ml standard to be too weak, but for me it's a perfect amount. I came to e cigs from a 1.5 pack/WEEK analog habit so nic level is a lesser concern... the 16mg cartos I have are pushing it and the one bottle of 24mg juice I have is great tasting but the sensation reminds me a bit too much of using chewing tobacco, which I could never tolerate and this alone nearly put me off of e cigs until I found this stuff. Now if I could only get the other nhaler custom juices with 12mg without going to high voltage...
maybe I missed something? Not possible.. probable, but that's all I've got. Hope it helps.