I have a 3805 which I'm very happy with, but I'm not really sure how it compares to the 3803. There was a thread on the Audioholics BBS about it not long ago, though:
http://forums.audioholics.com/forums/showthread.php?t=2164&highlight=3805+3803

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::