You'll get a million different answers, because there are plenty of bullet lubes that work really well.
I personally use Carnauba Red, which you can get here: http://www.lsstuff.com/lube/index.html
All of the lubes made by White Label Lube are really darn good, and they are much less expensive than other commercial offerings. I picked 20 sticks of lube for $38.00!!! Short of making your own lube, that is one heck of a deal!