I think 32GB per host is fair. It just so happens I use a Dell blade server at home and 4 of the 1955 blades are dual Xeon quad cores with 32GB of RAM (the developement cluster) and 4 are 1955 dual Xeon dual cores with 16GB of RAM (the sandbox cluster). The remaining 2 1955 blades are non-ESXi physical servers.
Cheers, Yours Udin 