While all the guys mentioned would certaintly be great, we need more usable cards at weak positions like SS and 3B. Two guys that fit this bill perfectly are:
Omar Vizquel SS: Switch-hitter, soon-to-be hall of famer and the greatest defensive SS ever (even if you disagree, you know he was pretty damn good) I don't want his monster year where he hit like .330 but just a humble Omar year that would be priced around 2-3 mllion. If we were to get a card like this (he's got dozens of 'em) it would be used in practically EVERY league.
Scott Rolen 3B: One of the best players of this generation until injuries caught up with him. He had some super years that would play great in this format and he was a 1 for most of them.