It's been a while since I've looked at these but I believe it goes something like this:
Series 1
Alice
Caterpillar
Mad Hatter (White Version)
Series 2
Alice (Hair in her face) This would be the one Dr posted
Tweedle Dee
Tweedle Dum
White Rabbit
White Rabbit (Previews Exclusive- Black)
Series 3
Alice (Towers Exclusive- Black Dress/ Glow in the dark cat) Aka Goth Alice
Card Guards (Combination of Heart/Spade, Heart/Club, Diamond/Spade or Diamond/Club)
Jaberwock
Series 4
Alice (Bloody version)
Caterpillar (Different color)
Mad Hatter (Grey Version)
Jabberwock (Different color)
I'm not exactly sure what the color differences are for the Caterpillar and Jabberwock, I think they are so subtle you wouldn't even realize they were different unless you had them side by side. I know I didn't, I thought they just re-released the same ones again
These figures have always been a bit pricey but I think they jumped a little more recently because everyone was planning on an Alice movie in 2009. That has since been put on hold though

so prices may start to come back down a tad bit.