That's models pretty impressively for such a small box, but you do pay a premium, at least in the US market.
I'd skip the 1000 watt amp, though. According to WinISD, 360 watts will drive the
PR to Xmax at 24hz and below.
Regarding output expections, note that Solen's output numbers at 25hz do not describe the measurement conditions. They undoubtedly include room gain since the 1m ground plane simulation is 106.7db with 360 watts.
Keep us updated on the build.
-Brent