Denon have always made good consumer grade audio gear, I'm not sure about their Pro Audio stuff but I'm thinking it can't be bad with the Denon name on it, same for Pioneer.
With Mixers (and built in effects), it's like most things..... you get what you pay for. Depending on where they're made and components used will dictate price to a certain degree. I'd rather have japanese made capacitors/inductors/op amps/transistors that are accurate (and made for the application) especially in an EQ then shithouse chinese junk in a useless built in effects processor which might sound OK when soloing individual tracks/channels but will sound shit in a mix.
Depends also on how you're going to use a bit of kit too. I wouldn't care to use cheap shit in a live situation but would think twice in a recording environment. Recordings potentially last forever, live performances are soon forgotten by yourself and even sooner by punters and realistically 95% of the punters wouldn't know the difference between a $10K Neve/SSL/API EQ or a $150 Behringer/Alto EQ.... not live anyway!