newsjeff,You have me drooling. If I needed another amp (or even if I didn't but I had the spare cash lying around) I'd get the Welborne 300B DRD kit in a minute. I have the Welborne Laurels and love them. They mate very nicely with the Foreplay.
Heaven help me, but I'm also with you on the 300B vs. 2A3 issue. As sensitive as the Theater 4s are, I still like the extra power a 300B provides for Mahler or Eminem.
Let us know how it turns out.
e