Best Tubes for Golden Tube SE-40?

I just bought 2 Golden Tube Audio SE-40's to use bridged mono for the top end of my system. I have a Conrad Johnson PV-8 preamp and Snell A-III's. I'm using an Adcom GFA-555 for the bottom end. Of course each SE-40 has different tubes from different manufacturers (I bought them used from two different people) Can anyone recommend the best tubes to use in these amps. They will only be used for midrange and highend so I'm looking for tubes that excel in this area. Any help would be greatly appreciated.
For my source I use a Rega Planar 2 W/Grado Signature Platinum Cartridge and a Conrad Johnson Sonograph CD player.

Thanks
Rick