The balance control is going to be difficult. Also, what kind of preamp do you have now? Maybe you can try some different tubes.
That said, if it must go I would consider an Ayre K-5 or possibly a used K-1. BAT's SS preamps are very nice as well.
That said, if it must go I would consider an Ayre K-5 or possibly a used K-1. BAT's SS preamps are very nice as well.