There are some "subtle" differences between the models.
AVR-3802/1082 only features 3 crossover points for the subwoofer, the AVR-3803 features 5 points.
AVR-3802/1082 only features 5 composite and 5 S-video inputs, where the AVR-3803 features "7" for composite and 7 for S-video.
There also might be some other differences. The best thing to do might be to hit the Denon Web site and pull the information for each respective receiver and lay the pieces of paper side-by-side to see what is different.
Ouch. $57 for me (ground shipping) when I checked the calculator. If one can get free shipping, some deals at eCost are OK. However, I think they try and make up for the free shipping on some items by over-charging on the others. :frowning:
Given the situation with the AVR-1082, I'd jump on a used AVR-3803 for just a small amount more.