Yea, same problem...come to think about it my car is a wreck, but it can be easily fixed if you have the part. I know hardly anything about working on my car and I did it. Especially considering you took off the door panel before it shouldn't be a problem. My motor wasn't working and i took off the panel-tinkered with it a little and it worked again. It had worked for a solid month after doing this and then failed to work again. It has something to do with how the wires get positioned or something like that. I recommend trying this method first and opting to buy a new motor and doing it yourself. It shouldn't be too hard so don't waste your money by going to a shop. Luckily for you--you've taken off hte door panel before. In my cas it was the first time and i ended up fucking with the window lock feature rendering it unusuable. However, you've done it before so it shouldn't be too difficult.
If you wanna buy a new one just check out any site mentioned in the FAQ or
Window Regulators