I really enjoyed Braid and Soundshapes. I think right now they are $10 each. High replay value on the latter. I liked Journey too, and although it is fairly short (about 2 hours) it does have beautiful, breathtaking graphics.
I recommend that you get all three if you can, even if it means spending the extra money. If I was in your situation, I would buy the two games. Also, PACMAN DX is awesome if you are into Pac Man games. Or just get a 3-month PS+ subscription, it should get you KOF XIII ( a great fighting game) and a bunch of other free gmaes for three months.