Saving for a rig. What do I get?

I was wanting to find out what GPU'S are best for ravencoin, i'm looking at getting RX580's but there might be better ones out there worth my money, it'll be my first rig so I won't have a huge budget but for 3-4k I might get something decent.

I currently use my gaming pc and I get about 33mh/s on it but I would rather save for a rig so I can use my pc for other things.

I also live in Australia so prices are a bit higher here unfortunately :/

Thank you 🙂