Did a benhmark on Vultr multi-core serie and their 24 core 64 GB RAM server, and the result was the highest I ever have seen. 9600.2 points in UnixBench.
Use my aff. link: http://www.vultr.com/?ref=6802732 if you want to try out Vultr.com and they offer $5 in free credit for all new customers.
Of course, this server is not cheap, $600/mo, but at Vultr.com you can rent it by the hour, and it cos $0.90 per hour. So if you need some serious CPU power for some time, but less then a month, this might be the right thing for you.
So they now hold the first and second place on my Top20 list.
Use my aff. link http://www.vultr.com/?ref=6802732 if you want to sign up. They offer a $5 free signup bonus for all new customers.