Peeps! Help! Book advice!

I, uh, read Small Gods and loved it....and am going through Pratchett withdrawal. I went to the bookstore and stared....because so many Pratchett novels....no clue where to keep going....

So, I have read The Colour of Magic, The Light Fantastic, Equal Rites and Small Gods. I understand that you don't really hafta read the Discworld stuff in order, so which one should I read next? I need a fix.