I use a 1/2 ton from Harbor Freight for my logo stamp and sometimes rivets. No more breaking out the sledge hammer for a clean logo! I just put a clean piece of steel on top of the revolving piece and press directly on the stamp. I have a few custom 3d hard plastic stamps and they do just fine under the press.... so I know the metal stamps are good to go unless you get crazy with the press.
I regret not going with the 1 or 2 ton press though. I figured a 1/2 ton was already overkill when I bought it.