what about the new a40 from pioneer at half your budget new
https://www.pioneer-audiovisual.eu/...plifier-designed-analogue-and-digital-sources
been reading the reviews over past few months
i also ran Chesters with a Audio Innovations Alto, Nait3 a Nac72/Nap140 and most recently a Hegel H360. The better the amp the better they sound!Castle did some great loudspeakers in the 90'ies
I ran my Chesters with anything from Nait's 62/140, to (Farlowe) Exposure 15/20, Creek, Onix, Obelisk.
Plenty of choice out there