At your price point, I have liked Dali speakers. Currently use the Onkyo with Dali Zensor1, but it has matched well with Dali Ikon 1, and Vienna Haydn speakers.
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A pair of Klipsch Heresys or Heresy II's will sound wonderful with your 9555. I have had very good success driving mine with 90's vintage Onkyo/Integra integrated amps and stereo receivers. I personally have not heard the 9555/Heresy combo but know some that have and they are astounded at the sound quality.
For example, Focal 714V Tower.
I had an Onkyo A-9555 powering my 2-channel system for four years. It would totally drive these speakers. The Onkyo has very low noise and good dynamics.
I used my Onkyo with now out-of-production Mirage OMD-15s, which had dual woofers augmented by a passive radiator and a port. The Onkyo controlled this setup very well, while conveying the midrange and treble with transparency without harshness. I can definitely see where Wharfedale Diamond towers would be a good match, and as you say, could provide a fuller sound than the small Focal floorstanders.