If you don't have a lot of dirt experience then I'd say go for a 650 single. Maybe even a 450 single. I've got the beemer (09 g650gs) and when my dad and I were on a month long trip on the CDT (we both have a lot of dirt experience) I was able to make my beemer move just as quick, and a lot of times quicker, through the dirt than him on his KLR with his new fork springs and emulators. If you really wanted to move through the dirt and be able to carry just enough gear to get you by you should go find used XR650R... not that piece of shit L model.
When in doubt, power out.