If it's just 3 it's gotta be Bonds, Clemens, and Johnson for me. If it opens up to 5 then I'd probably add Piazza and Martinez.
I'm going to assume you mean Pedro, not Edgar, in which case I agree with you on both counts.
Given 10 spots, I'd also vote in Biggio, Bagwell, Smoltz, Schilling, and Raines, I guess, though I also really want to be able to vote in Trammell, Mussina, Edgar Martinez, and maybe also Larry Walker or Jeff Kent.