What current power tubes for a Mesa Mark IV?

What current power tubes do you recommend for a Mesa Mark IV with good results? I used to run SEDs on mine when I had one a long time ago, but that's not an option anymore. I was looking at the Preferred Series 6l6s from the Tube Store (kinda like a TAD), but I am wide open to suggestions.
 
What current power tubes do you recommend for a Mesa Mark IV with good results? I used to run SEDs on mine when I had one a long time ago, but that's not an option anymore. I was looking at the Preferred Series 6l6s from the Tube Store (kinda like a TAD), but I am wide open to suggestions.
I seen people buying tubes from Mesa still
 
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