I also endorse Ortlieb Front Rollers. In use they seem almost purpose-built for the Tikit front rack and having any added weight low and forward works well for handling.
An innovation that has worked for me and that makes the Ortliebs a possible solution to the original poster's need: I bought an inexpensive laptop bag that fits inside one of the panniers -- this gives me the pockets and compartments that I want for laptop, papers, etc. I pull it out and take it to meetings without concern for mud spatters. Overall less clunky I think than the special-purpose "office panniers" I saw when I was shopping. The laptop bag is a no-name brand bought at a Carrefour so this is a cheap solution too. For my commute the other pannier takes spare clothes, overflow papers, groceries purchased on the way home, etc., and I have the flexibility to put both to other purposes at other times.
Last edited by BWP; 08-21-11 at 03:44 AM.