I'm in the same boat as you. I'm shopping.. I'm currently using soft tank panniers, tank bag, Wolfman Alpha bag and a Pelican small topbox.
The Wolman is nice, but I'm a hard pannier user for years on my other bikes and I really want to do the same with my KLR.
Now the dilema.. I have one friend with a set of African Twin aluminum panniers (much like the HT bags) and another friend with 1550 Pelican cases.. The upside of the Pelicans is that they're indestructable, and cheaply replaced if you were able to actually destroy one.
But I also like the top loading of the aluminum bags.
I'm going to sit on this one til this winter.. I'm leaning towards the HT bags, but I'm researching also..