Sergei Gonchar, D
From Wiki: From the 2000-01 season to the 2009-10 season, Gonchar tallied exactly 500 points, which was second among NHL defensemen only to Nicklas Lidstrom's 550 points. Gonchar was also second among NHL defensemen in assists during that span with 372 assists, behind Lidstrom's 434 assists. However, he led the league in goals by a defenseman during that span, scoring 128 goals.
Clearly one of the premier offensive defensemen and PP quarterbacks of his generation, the Sarge, after a somewhat difficult start, established himself as the team's undisputed #1 defenseman, garnering some Norris Trophy consideration along the way. While his accomplishments will hopefully and eventually be surpassed by [undrafted], I feel that at this point Gonchar is still ahead of him, if not by much.
His numbers as a Penguin: 322 GP, 54 G, 205 A. Playoffs: 60G, 7 G, 37 A.
Edit: Comparing Gonchar's stats to Coffey's is just mind blowing - Coffey appeared in 9 more games and had 179 more points. Which pretty much tells you what an awesome offensive force Coffey was.