alu panniers info needed

[Mudbugger]

I've been looking on the internet but could not really get good info.
I'm buying a 2007 1200GS and need a set of panniers.
1. Which is best? Why?
2. Always the second question, where can i get it the cheapest?

 

[mountainbiker]

 

[Scribble]

 

[Adventurer]

 

[Mudbugger]