My current favorite full size keyboard is my Unicomp Model M for Mac - the buckling spring switches are sublime, and there is no ping, unlike my IBM Model M with silver label - that beauty is my king of ping.
For when I want something quieter, I'd love to get my hands on an ANSI Realforce 104 that's uniform 55-g. For now when I want quiet, I have my KBParadise Matias Quiet Click TKL, as well as my RF 87U and HHKB Pro JP, so I can't complain.