What is the best thing i can get for that, asic scypt seems more bang for the buck, but I would appreciate other opinions
The scrypt miners are really pretty much in their infancy. Gridseed only produced the first orbs a few months ago. Since then, a ton of options have come out, and many more are in the works.
At any rate, with a budget of 0.5BTC you're not going to get a whole lot, but there are still items to choose.