I'll second Voodoo's idea of selling your Classic 50 elsewhere. Those things are getting highly prized. I personally would never get rid of one of the 50's if I had one. They keep going up in value and desirability.

Get a Gibson if you have to, but try it through the 50 before you decide to get rid of the 50. You'll never get what it's worth on a trade in and I'm sure your Gibson will blow you away through that amp.

Try selling it locally first if you have to.