Interesting topic. I'm tempted to pick guys only from a long time ago, just to see how they fare against today's players. I had a lot of different names I started to type out, only to change my mind. And if I thought about it more, I might change my mind again.
1. Ozzie Smith - There are always great hitters who mash the ball. There is only one Wizard of Oz. I would love to see how Babe Ruth would do throughout history, but honestly, just seeing him for a couple seasons would be enough. You can never have too many highlight reel plays.
2. Edgar Martinez - One of my favorite players ever, he was dedicated to his job, is a great human being, and was a career Mariner (who never made tons of money), and getting more wins for the Mariners is definitely a motivating factor for me.
3. Felix Hernandez - Another player I love, who's a career Mariner so far - and he's put up with some of the worst Front Offices in team history, so I think there's a good chance he'll stick around. We're paying him a fair chunk of change, but having an ace is important.