In that price range, I would bet most will recommend a 1933 Goudey. Classic
and colorful set, four possible Ruths to choose from. You can get one in VG-EX condition for around what you have to spend.
There aren't a lot of mainstream Ruth cards from his playing days because there weren't a lot of cards made of him. Most people ignore the strip cards because their images are cartoonish and their production quality were pretty awful. So you're stuck with oversized cards/photos pasted to cardboard backings or the Goudeys.
The Sport Kings is cool too, but the set is not as well collected. They're a little more niche.