I want to get one of those cool Carradice bags for my saddle.

I need your help to make me choose because it's kind of hard from the web sites to get a really good idea of what they represent.

Purpose:
"Destination" day trips or overnight trips (credit-card camping with only a very light load) - I won't get myself a touring bike for a few years but in the meantime I'd like to have some flexibility for traveling with a load on my road bike

Constraints:
I have a pretty small bike (I'm 5'4") with limited clearance between my saddle and my back tire (although it's at least 9 inches)
I wonder if they will work on my saddle... Selle Italia SLR style. Has that been an issue for others? Surely they work with other saddles, not just with Brooks!!

Choices:
I've been looking at the Pendle (don't you have one, Lisa?) and at the Lowsaddle Longflap, and also at the SQR Slim. I'd like a bag that has pockets on the outside and maybe also straps so I can tie a jacket on the outside. I'd prefer the bag to be black...

Please, please, please help me and enable me to make this purchase before the summer is over!!