One other thing to note, is that a DSC/DTC system is the best thing you'll ever do to your scope.
I don't have Argo navis (yet), but I've got SkyCommander, which is similar, but older and less feature-packed. You tell it what object you want to look at, and it tells yuo where to push your dob so that it will be in the FOV of your eyepiece.
It is the best investment I made to my scope for visual observing. I can now view soooo many more objects in a night than when I was star-hopping. Well worth the investment.
There's a page about the skycommander on
my scope
here, but as I said, the argo navis is a much better option and i'll be upgrading to AN in the future.