Love the 'Sheed, Augmon and Miller picks. I think Augmon was more underrated in his Hawks days, though. I loved having him on the Blazers--he really fit beautifully into the fleet of long, athletic defenders that Portland employed at their peak of that era (1999-2001).
I'd pick Miller by a hair over Wallace. I think Wallace was awfully underappreciated for his excellence (and before his time--'Sheed would basically be the ideal power forward in today's game; great defense and offensive spacing out to the three point line? No one would be pissed about him not posting up more) but most fans generally accepted that he was the team's franchise player. I think Miller, though past his prime, got less credit than he should have for his fine play and steadying influence on the offense.