Amps that pair well with the Mesa Boogie Flux-Five

gain stackingStacks two gain stages for more saturation than either produces alone. (low gain → high gain)

Mesa/Boogie Dual Rectifier Solo Head (Multi-watt) leans toward transparent, and that's a real, usable character to pair with

Comes later in the signal chain

fills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → smooth)

Mesa Boogie Mark Five:25 1x12 Combo's own transparent character is the real reason this is worth trying

Comes later in the signal chain