I think the OP is in for a big change.
Selling gear you like is easy. Replacing it with another sound and getting to like that one as much is a far more difficult task. Don't think this rig will be the one. You're making the first step on a journey.
My suggestion would be to replace the cabs first. Running the current amp through a fairly neutral cab, like Barefaced, would keep a lot of the old sound intact, while improving the definition, punch and tone, in a significantly lighter format.
One of the BF 212's should easily match the old rig for volume.