Just choose a VPS provider who's datacenter is geographically close to your target audience. Also a host that is fairly close to you, since you'll be the one accessing the VPS the most.
Take a look at
Lusovps.com and
QHoster.com - they are two reliable host with well-balanced vps hosting solutions.
You will see how fast support team answer your specific questions, because they hold an interest in facilitating their clients work.