I have a system comprising B&W 685’s Marantz CD6003 and a Rotel RA-05 amp. I listen to a lot of my music now via an airport express streaming apple lossless from itunes on my PC. The sound quality is good but not CD quality. I understand that the airport express is acting as a DAC to convert the music to analogue before going into the amp. I’m happy to upgrade parts of my system but one at a time with the speakers being last. Will I notice a big difference both though streaming and via CD if I get either an amp or CD player with a built in DAC? I will struggle to get a separate DAC on my rack so would prefer one built into a new amp or CD player. If so what would you recommend I change first, amp or CD player, and what should I get or listen to with a budget of £800?