Custard's Last Stand is my #1 favorite vape right now. I've put about 20 ml of it through a carto
tank and the carto is still going strong, so it's definitely not a clogger. I also have their Creme Brulee on the way to give it a try, as some people say it's even better than CLS (but for me it's hard to imagine anything being better than CLS!).
Nicoticket also has a straight vanilla flavor (Frenilla) - I haven't tried it yet, but I do know that all his vanilla flavors come from a genuine vanilla bean steep, not an artificial flavoring:
http://www.nicoticket.com/frenilla/