best amp options under $500?

[gn_rx7]

Amp will be used to power 3 way front stage (focal 165f3)

Need at least 75 wpc and would like something in the 100-125 wpc range.

Got a good deal on a PDX-F4, but not sure if i should go with AB class instead of D. Currently, I only need 2 channels, but 4 channel would be optimal to provide the option to bi amp the mid/tweets and 6.5" separately or provide the capacity to add an 8" mid bass later.

Have the full range D class amps caught up from an SQ perspective or are the AB class or tube amps still a lot better for mids/tweets?

Currently researching these amps and will consider any other suggestions under the $500 range.

JX360/4 or 2

Ks300.4

Helix b4

Butler TDB 275

Would also consider spending a little extra if there is an amp that is significantly better for a few extra $

Is a Mosconi worth the extra $? That is what was running the speakers on the demo board.

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[LosIsATool 5,000+ posts]

SAX-150.4 - Sundown Audio 4-Channel 200W X 4 RMS Amplifier https://www.amazon.com/dp/B00NPB6AVY/ref=cm_sw_r_awd_IV1Qub09Z2C7M