Cost effective way to convert 12v DC to 7.6v DC @2A
At your power levels (60W), you really want to be looking at a switcher.  Maybe you can find a off the shelf Dc-DC converter for your voltages and power, but probably not.  That leaves making one yourself.  Since this is a one-off a few extra dollars for the chip doesn't matter.  Linear Technology, National (now part of TI), and TI have a decent assortment of buck regulator chips.  For simplicity, go to the Linear Tech site and look around.  At 8A, you will need a chip that drives a external switch as apposed to one with the switch built in, but there are plenty of those.  If I remember right, Linear also has a decent set of app notes.