Intended use for the amp and respective cabs, please? I understand the the Matchless Lightning is a Vox-ish amp, so question is whether you want to go all chime or try to balance this out slightly. Perhaps going w. the 2x12 for cleans and the 1x12 for dirt?
1x12: Easy! Blackhawk (not HP) it is everything a Celestion Gold is & more. Also, sounds better than the Black-n-Blue, plus can take 50-watts RMS power if you decide to move it to a higher power amp! That’s Gods speaker, and it’s my first choice for my own combos with 2-6V6 or 2-EL84’s. (www.VaughnSkow.com)
2x12: I’m assuming you’re going for something DIFFERENT from the 1x12 … so, go with the ET65/Ret 30 combi … always a fantastic choice in all situations