At the 4" - 6" driver size, I'd go JBL, and you might want a subwoofer with that. When you get up to 7" - 8" I'd side with Yamaha for mixing, but you really need the subwoofer with it. 7" - 8" without a subwoofer, I'd go KRK or Mackie, keeping it somewhat affordable.
Yamaha's aren't good full range until the 8". The Yamaha 4" - 6" are missing some mid and bottom to them; uneven sound. JBLs are pretty consistent and honest all through from the low mids to the highs, but at 5" drivers, you'd probably want a subwoofer to get some of the low end to appear.