Traudio,
ARC is indeed one of the big names in hi-end gear. If you have a trusted tech who has experience in repairing ARC gear, I say go for it. However, if you don't, you will likely be waiting a long time for possible repairs (if needed), and you'll pay through the nose for ARC to do them. I would honestly go in a different direction...maybe Rogue, Raven, or Quicksilver. A great combo, btw, would be the Quicksilver line stage and the 100W Rogue amp. Plenty of muscle, reliable, and won't cost a fortune to repair if ever needed.