The DXR10 is not nearly loud enough. It's only a 10" speaker after all. Spend the little extra and get the 12. That way you'll have extra headroom as opposed to not enough. I have the 10 and it's really only good enough for bedroom levels or LOW volume gigs that have a PA. The DXR15 is awesome and I prefer that of the three, but it's also 50lbs.
DXR10: 1100 watt, 131 db SPL, 56 Hz - 20 kHz
DXR12: 1100 watt, 132 db SPL, 52 Hz - 20 kHz
You really think these values make the difference between "is not nearly loud enough" and "extra headroom"?