ARC, Spectral, Cello for Avalon Eidolon?

I currently use an ARC Ref 1 preamp with detachable power cord and a Cello Duet 350 amp to run my Avalon Eidolon.

I am trying to plan auditioning of different products. However, since my budget may not match that of a 'normal' Eidolon owner, I am also seeking opinions on the different models of ARC, Spectral, Cello, etc. amps that may match well with the Eidolon. Your opinions may help a bunch in the event that, due to a limited budget, I am unable to engage in extensive listening prior to a purchase.

I listen mostly to small jazz combos and some orchestral works.

If any of you have auditioned the Eidolon with Spectral (DMA 150, 180, 360; Series I, II; etc.), ARC (Reference 300, 600; Mk I, II, III; etc.) or other amps (perhaps Cello Performance II) then please let me know the details of your opinions on the relative merits and demerits of the different amps.

Thanks in advance.
John.