Marc,

> 9VAC secondary, 2.8KVA)

2.8VA ?

> Post transformer, I'll do the classic rectifier make of diodes
> (1N4004s)/LM7805 equivalent/bypass caps.

Although the transformer is low supply current, you might want
to add a series drop element (resistor or Zener) to take a little
of the sting out of the voltage drop. After the bridge, you might
have 11V (if the transformer is accurately specced). Meaning
the 7805 will have 6V across it. At roughly 300mA (approx
capability of the transformer) load that will be 1.8W of heat to
diddipate in the 7805

Not a great deal, but I think it's a consideration to be aware of

If you add a resistor before the 7805, to drop say 3V at 300mA,
then that's what heats up, not the regulator

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