I think I found the perfect PSU. I may order it when I'll upgrade to a heat bed.

SilverStone ST45SF. Very small (125 mm (W) × 63.5 mm(H) × 100 mm(D)), provide 36A to the 12V and 22A to the 5V of MAX (not peak).

It's an ATX PSU, so it will need a "load" to power it. 0.6A isnt that much, so a fan could do the job. ATX PSU are really easy to modify.