Hi,
M50 is priced at £2400. The rest of EWA's range is priced here https://www.elsdonwonforaudio.com/amplifier-prices-uk
I'm using Ali's Slagle at the moment, but I haven't decided on a Pre as yet. My system sounds the best I've heard since I started out on this mad journey.
Main bottleneck now is my speakers, but I'm working ( wearing my wife down lol ) on that one 😁