Current situation: We have a small PA system running just the vocals through a 100w (SHS PM400) powered mixer and a couple of mains. The guitarist has a 100w full Marshal stack (though he usually uses half of it) and I've got a 300w BX3000T with a Peavey 1516. Drummer is loud. What we're looking for is one or two monitors, with an eye towards upgradability of our current PA. We play fairly loud classic rock stuff, but have only had to use our current PA to play to maybe 20-30 people (played a larger venue, but used their PA system) so far. However, I'd like to be able to upgrade our PA for larger places (100-150) in the future w/o having to ditch any of the equipment we are about to buy. We're on a budget of ~$500-$650. At the very least, we need one monitor right now, possibly more later. I've been thinking about our options. The top 3 options I've thought about are: 1. New power amp (~1000w), mixer, passive monitor cab. If we buy used, we can swing this, I believe, for about $600 or so. We could scrap the SHS with this setup. 2. New mixer and powered monitor. Idea being that we keep the SHS, run the main out to the effects return on the SHS, and run the mixer aux. to the powered monitor. Cheaper than options 1 & 2. 3. New powered mixer w/2 internal amps, passive monitor cab. We could scrap the SHS with this also. Any other ideas? Which of these options sounds like a better solution for us, given the requirements I've listed above?