Try www.avforums.com - more likely a higher number of Castle speaker owners there.
They really need something of higher quality than a budget AV amp IMO. If you're just planning 2 channel Hi-Fi consider something like a £200-£300 stereo integrated amp.
[edit] Rega amps would be a good match. The new line Rega line do have a cheap 'n' tacky faceplate though
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