A few notes: Lipo-6 is a Synephrine product that also has caffeine in it. Mixing ephedrine with that = too scary for me!
Ephedrine is NOT Ephedra. I'd personally stay away from the ephedra-containing products since all you really want is the active ingredient, ephedrine. Who knows what other crap is in some of those other ephedra products.
The most ephedrine per dollar that I know of is Vasopro