If you are looking to minimize weight gain and limit your impacts to fuel milage then you'll want to purchase a winch with synthetic rope instead of steel cable. Going with the synthetic saves you 20 to 30 pounds.
Also, if you want to maximize aerodynamic efficiency, and your winch use will be infrequent, then you might like the hidden winch mod.
Winch mount W/factory bumper
Otherwise the top mounts like mine work great. I used the Smittybilt mount #2804. It does require relocating the vacuum pump from behind the bumper. Warn makes a similar mount that doesn't have to relocate the pump.