Ed,
This sounds like a great start. I have a friend with a Cornet 2 using the Sonicaps and it really kicks!
I could easily enjoy his C2. We played mine side to side and I have to say the only slight difference I could pick out was in the width of the soundstage that comes from the Mundorf Silver In Oil and those hideously expensive "nude" Vishay S102 resistors which give you micro detail that really makes things sound real.
The nice thing about your Hagerman is that the board is built rugged.
As your budget improves, you can take out any part you want to roll, use some #2 no clean copper wick to remove the old solder, and solder in your new piece. I have exchanged some pieces nearly a dozen times without ever lifting a trace.
Now that is what I call "TOUGH".