Check out the Yamaha DXR series. I have run two DXR -8’s and a single DSR12 Sub with great success for small venues. Sounds great…easily transportable and good value. You could also opt for two DXR12’s minus the Sub for starters and add a single sub later. The DSR sub is already wired to support stereo in and feed two mains which makes it a great option for a small single sub setup