Driverside window won't go down
So I say check the motor out, as for brands I don't know.. someone else might be able to chime in and help with that.
http://shbox.com/page/windowmotor.html
I like the Dorman and Siemens brand motors. AutoZone sells them, I've seen them carry either brand at different times.
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Like Stinkee pointed out, this happens when a replacement motor is bolted in to the regulator and loosens up over time. If you haven't ground things up too much, you can just simply lock-tite the bolts back in place. If its been going on for a while, you may have ground down the gear teeth on the regulator. (In that case, you will have to replace the regulator, which is a major PITA.)
If you get a mirror and flashlight inside the door, you should be able to inspect the carnage.
This is a classic motor failure due to water infiltration. When you whack the door, you loosen up rust and garbage inside the motor. Go with a replacement Dorman motor (a new design better sealed from the elements) and you should be back in business. 






