That looks really nice, in fact there's one on Finn right now (it's not you, is it?!).The Geek Out V2+ has more than enough power for them and the matching is beautiful as well. I've seen them used on Finn.no for very decent prices several times... .
They only list the power output into a 16 Ohm load though, would have been nice to see that into different loads.
Maximum current output at 4 Volts at high gain, it seems. O2 does 7 Volts at high gain, if I'm not mistaken.