First off, ignore human, +1 skill point isn't that important, and feats are plentiful in E6. Instead go for either whisper gnome, neraphim, or something with an Intelligence bonus, lesser tiefling or possibly lesser cansin if you can swing it, from a dragon magazine. Get as many Font of Inspirations as you can. For prestige classses, I'd recommend Beast Heart Adept from Dungeonscape or even Sandshaper, since you enjoy shapesand and it's not a bad class. I'd also recommend picking up Hidden Talent with Psionic Minor Creation, since if you don't have that, there will be no large quantities of poison around.