As far as I know, the sativas are the better ones for pain (as opposed to indica). Beyond that, I can't really say.
If you'd like to try something a little different, mix a sufficient amount of hash resin in a glass of wine. It was used medically as a pre-op analgesic before general anesthetics were available. Or, if you can't get hash, steep a couple of grams of bud in a high-concentration alcohol (vodka, rum, whiskey, etc) for about an hour (some people have told me it needs to be done overnight, but I've heard of it being effective after half an hour). If you are susceptible to alcohol this is a bad idea. In large quantities its known as a green dragon, and you will get very very fucked up if you have too much or get drunk easily.
I'm currently reading a book on the toxicology, pharmacology, and therapeutic potential of cannabis, and I'm just about to get into the section on pain. I'll get back to you when I know more.