Hello I am currently renting a server from OVH, I notice that 2-3 times a month we will experience downtime due to the fact the network our server is on ends up getting attacked. I am wondering if anyone can fill me in on the sites or services the exchanges use to stay online and have a secure server. I can tell you I pay now about $60 US a month for the server and we pay for Cloudflare Pro as well. I am seeing allot of big sites going with Amazon any tips would be appreciated
I'd recommend you have a look at
http://lowendbox.com as they've got many good VPS Services options.
As to specific services I'd highlight
https://libertyvps.net and
http://www.qhoster.com/vps.html which are good services with the advantage that they accept cryptocurrencies as payment method.