Great Trucks
Between the two you found, I would go with the silver one as it has low mileage, good price and nice color. But, before you do, I suggest that you inspect the car thoroughly inside, outside and underneath (for singn of rusts, oil/leaks).
A year ago I found a nice looking V8 silver Sport locally and was about to offer. Just out of curiosity, I asked to have the vehicle lifted up. I couldn't believe how bad the rusts were, the frame included. I walked away in the heartbeat. I found a much nicer one later from the south where there was no snow/salt on the roads.
Since the vehicle is in your dealer, where you work, ask if you can take it home for the weekend so you can drive it for a day or two, checking out how it runs.
If all's good, go for it.
Cheers