I own the Titans, both the passive and active units. The Titans are cheap, light, have nice cosmetics and are well suited for sound projection in small to mid-sized venues. They can be used as monitor speakers as well. Oh, they are also quite powerful. I have 10 (live) instruments, excluding drums, and 4 vocals going through these speakers every week and, so far, the titans have held up very well. An advantage with the Titans is that you do not seem to get tired after listening to it for long periods. I power the passives with the Yamaha P3500 amplifier. Before buying the Titans, I tested the speakers using the Naim test CD as I was quite familiar with the sound from this CD. I suggest that you bring along a CD that you are familiar with and test the speakers before buying them. Be sure to position the Hi-freq slider to flat position in small venues.
My first mixer is the Yamaha MG16/4 which I still use to connect my instruments. I needed to expand but seriously could not afford a bigger mixer or to buy a smaller Mackie or Yamaha, etc. With no choice left, I went for the mixer you mentioned. My only issue about this mixer would be the quality control as I had to send the in-built effects unit for servicing twice within 3 months. A fluke, perhaps? Also, the knobs feel a little cheap. Other than that, I am rather happy with the sound I am getting. I use this mixer for the vocals and like it for the warm tone that the mixer adds to the vocals without effects. Then again, while I like this, you may not
If all is well with the mixer, it should be able to handle things as well as the MG 16/4.