About to hit new preamp tubes..recommendations

[atoni]

I'd like to replace my preamp tubes. Do you guys have tube recommendations to fill my Laboga Mr. Hector V1-V4 sockets? Here's how it goes

V1 - first stage in preamp
V2 - second stage , only for Gain channel
V3 - stage 3 of the preamp
V4 - inverter

Everything is now filled with JJ's, but I'm really interested to try out TungSol and Shuguang...and others too.

Thanks!