Discworld

I have read:
-The colour Magic
-The Light Fantastic
-Sourcery
-Troll Bridge
-Equal Rites

So what Discworld book should I read next?  Should I keep with the Rincewind novels, read the next in the Witches novels, or read something else?  I plan on reading all the books in time but I want to read them in the best order possible so help me out.

>>12

What are all these letters, there are pages and pages of them with no pictures. Oh I don't like that at all, I can't be bothered to read all that!

I'll just post something controversial and untrue on /book/ to express my rage at not having the attention span required to read anything larger than a post on a message board.