RE:Help choose speaker for my Blackheart BH112 and Egnater Rebel

Hi all,  my rig sounds great already -- Egnater Rebel and Blackheart Cab with 1 x 12.  I play classic rock, blues, John Mayer.  But in man's constant quest for better tone, I thought I would get a new speaker.  My Egnater Rebel 30 is 30 watts.  it can blend between 6v6 and el 84 power tubes.

Looking for suggestions on a speaker to throw in threre and make my rig professional grade/kick ass sounding.  

Thanks in advance

That's a closed-back cab ... right?  If so ...

A Reaper HP for a nice balance of EVERYTHING.

A Retro 30 for a nice little addition of sweet top-end and solid bottom end.

Before you answered, bought an et65. Mistake? And yes, the Blackheart cab is closed back.

No ... and ET65 is NEVER a bad speaker ... :-)