Upgrade from Wyred 4 Sound STP-SE

Hello Friends,

I'm considering an 'upgrade' from the fine Wyred 4 Sound STP-SE. I love the transparency and bass control and the sound staging. I find my self yearning for bit more of that tube mid range magic but don't want to give up what I have in this pre-amp. I've been considering some of the BAT and ARC products which will be a significant amount of extra $$ even second hand. I'd love to hear your thoughts.