Alpari is good, spreads like you mentioned are the lowest, and leverage is mind blowing, although idk if anybody even uses 2000:1. Disclaimer: for very experienced traders only.
Up to 500:1 is okay, you will find most known brokers generally offering this much. Ones I have used in the past are ic markets and fxview. Both again low spread brokers. But I’m more of a broker-hopper. Now trying out forexbrew and qtrade.