Have you considered studio self-amplified monitors like Dynaudio BM12A or 15A? They're in the same range of studio performance you may be looking for, but more affordable than ATC or PMC. For ultimate performance check Lipinski and KK Audio too. If you must have separate amplifier and passive loudspeakers, they have good products too, but it'll be more expensive. Krell and Pass is highly recommendable stuff but more expensive than Bryston Depending on the power you need, there're plenty of brands making decent stuff at sensible prices.
For sources Mytek is OK, I like my DSD. Lavry and Benchmark are worth considering too.