Checking the gamesheets, it appears that Lombardi only wore the number for 9 games in October 2003 and switched to #18 on November 1.
October 29:
http://www.nhl.com/scores/htmlreport...4/ES020133.HTM
November 1:
http://www.nhl.com/scores/htmlreport...4/ES020158.HTM
Here's a photo from the November 1 game (the black letters on the nameplate lasted longer than him wearing #49 did):
He had 1 goal and 2 assists in those 9 games.
Regehr had 4 points in 20 games, all wearing #49. He gets my vote.