Methenolone Enanthate (Primobolan Depot) - expensive, and unless you've got a fantastic source you're opening yourself up to counterfeits. Great compound though... hardness and vascularity, but again - the cost. 300mg/wk is a good minimum dosage.
Drostanolone Propionate (Masteron) - not 'officially' manufactured anymore, but it's around... used by many as a contest prep agent, it's good for wicked hardness. 50mg ED is the usual, but many other possibilities exist.
Trenbolone Acetate (Finaplix, Tren) - probably the most popular, since you can make your own at home if you have a vet supply store nearby... ask some bros who trust you/know you and they'll steer you in the right direction. 50-75mg ED is usually good for a cutting cycle.
These are all excellent, and very popular, cutting agents.
Make sure your source is BIG-TIME legit before you even THINK of ordering masteron or primobolan. Otherwise you might as well just send me the money and I'll throw it in the fire for you...
-M
P.S. Karma if you're diggin' the info.