I always get my purlside decreases confused, as to which ones slant which way. I just don't use them enough to remember!
I think you'd want to use p2tog to match a k2tog on the RS. And SSP (described on the decrease page), to match a left slanting RS decrease.....
KnittingHelp Queen Bee
"Don't ask yourself what the world needs. Ask yourself what makes you come alive and then go do that. Because what the world needs is people who have come alive." Howard Thurman