Hello, maybe did you hear about VSAN, you can get a trial version, but is not free... i don't know if exist 3rd party products for that...
Note: new vSAN solution needs at least one SSD disk..
Note2: if your server have support, i suggest install ESXi 5.1 or 5.5. Since 5.1, you can move VMs between Hosts ESXis without Shared Storage...
But for Storage vmotion, I guess we still need shared storage in 5.1 and 5.5?
Is possible, in fact, i'm not sure but i think that is not possible to perform only a simple vmotion, you can migrate host and datastore.
Check this blog:
Note: only works by webclient