I use this one pretty much exclusively:
It gets very high reviews in the lump charcoal database (yes, there is such a thing) and it can be found. Note - be sure to get the one that says "Made in the USA" - if it doesn't say that it's actually made with a different blend of woods (mostly from Central/South America) that don't seem to burn as well.
I prefer to use this stuff for all cooking; if I'm using the Akorn as a smoker then I add wood chunks to the charcoal pile in the flavors I want. My family doesn't really care much for mesquite (though if I ever get around to doing a brisket that's what I'll use); I usually use hickory or apple for my smoke (I had some filbert wood from a local orchard that removed some of their older trees - that was really good stuff!). I also mostly smoke pork - if doing beef besides brisket I might go for oak.