I'm almost finished building my JTM50 Black flag head clone. The amp has a master volume so I can crank up the tubes without blasting my ears. I have an old closed back 4x12 with celestion seventy 80 speakers. My questions are what is the best 4x12 speaker combination for that head? Can I use the 4 seventy 80 80w speakers speakers and still get a good sound or does the total speaker wattage need to be lower around 60 watts? I was thinking celestion blue alnico or greenbacks would be best. I'm leaning more towards greenbacks at the moment, but that would put the total speaker wattage to 100w compared to the blues 60w. I'm kind of going for a blues/rock type of sound.