Been vaping RY4 with 0nic ever since I discovered BWB last April 2011. (It's gold to me because it is not readily available like the other juices.)
These are what I've vaped so far: Casablanca, Conundrum, Orchard Frost, Strawberry Banana, Malty, Honey Flue Nut, Applewood Tobacco, Cherry Tobacco, Split Coconut, 555 Exotic, Vanilla Bean.
IMO, you can't go wrong with any of them!!
Ejoker suggested vaping it using 1.5 dual coil cartos @ 5.5v and that's what I did!
I even get a decent throat hit with this setup.