I just ordered a new VPS from Vultr.com.
It has All SSD. Maybe the lowest price per memory. Pay $0.007/hr, you get 768MB RAM, 3GHz CPU and 15GB storage. It is about $5/month.
And more datacenters than other VPS service providers. There are 14 locations worldwide, right now.
I did following test though Benchmark Serverbear.
The simply results as below.
UnixBench score: 2242.1
I/O rate: 409.0 MB/second
Bandwidth rate: 97.4 MB/secon