We like the action feel of the X in #118, but we're not sure what it is doing. Maybe the X should be the same color as the rest of the letters? We liked the way PI stands apart in #59, but the I should be capitalized. And we like the underline in #99. Could you also try some more colors; maybe warm things up a bit?
looking great, can you lower the P symbol relative to the text (almost align the tops)? also, try one with the P symbol a bit smaller, say 80% of what it is now?