Give SolarVPS a look. http://www.solarvps.com http://www.solarvps.com It is easy to change resources, request additional IPs, and use the built-in DNS interfa

Give SolarVPS a look. http://www.solarvps.com http://www.solarvps.com It is easy to change resources, request additional IPs, and use the built-in DNS interface. $17.50/mo gets you a Linux with 2gb ram, 20gb disk, 1tb bandwidth and 1 CPU core. The support team is 24/7, and VPSs come with a server monitoring service (SolarRay) that can alert you if one of your servers or services go down. Also, a "One Click Application Install" feature just went into public beta. It might be helpful for what you are thinking about doing because it'd let you install, remove, backup, and restore multiple WordPress instances (among 200+ other apps) on your VPS in a snap. Full disclosure: I am a developer at SolarVPS. :)