exchanges for Algo-trading

[CrMg]

Dear community, I got really interested in algo-trading in crypto universe recently and looking for some decent exchanges to do this. Any suggestions?

I'm looking at such criteria as low comission (possibly rebates) for making, good quality service with minimum downtime and collocation services.

I've been loking into Bitmex, Gdax, Bitstamp and OKCoin. Any other suggestions?