Upgrading from 5.1 to 5.5

Greetings,

I am the network administrator at a medium size school district.  We have a small VMware environment consisting of 3 hosts running ESXi 5.1 and Vcenter appliance 5.5.  I will be replacing the hosts with two new hosts with much more memory and processing power.  They are all Dell Poweredge servers.  My game plan is to add the new 5.5 hosts to the existing cluster, vmotion all of the VM’s to the new boxes and then remove the old servers from the cluster.  I recently upgraded the Vcenter appliance to except the new 5.5 hosts.

My question is will I have any issues adding a host with much newer hardware to the cluster? Any insight or suggestions are greatly appreciated.

Thanks in Advance